If you had to describe each Mega Man X with one word or phrase...

[Flame]

Yes, Im ripping off Da Dood's Idea.
Since he made one for classic, i figured why not do one for X?

You know the drill.

X1: HADOUUUKEN!
X2:SHOOORYUKEN!
X3: Broken semi playable Zero
X4: Most epic final Sigma fight ever.
X5: Chock full of cameos
X6: RAGEQUIT
X7: Unlockable X. WTF?
X8: Pretty CG cutscenes
XCM: Hey look, I can turn into Mad Nautilus now!

[yanmaoption]

X1: Action upscale
X2: Zero collection
X3: Doors
X4: Pretty
X5: Nostalgic items put together
X6: Parts, all the way
X7: Failed attempt at 3D
X8: Good attempt at 2.5D
IHX: Awesome attempt at revision

Xcm: RPG upgrade
GBC1: Start is the new O
GBC2: Parts and scramble system at their best

[Da Dood]

Hell yeah!

X1: Memorable
X2: Refined
X3: The choices we make
X4: Zero
X5: Can't skip dialogue
X6: Bizarre
X7: Disaster
X8: Many toys, small playground

[Blackhook]

X1: I am not Megaman 10!
X2: Zero´s first revival
X3: KAISER SIGMA!
X4: WHAT AM I FIGHTING FOOOOOOOR!? (lol obvious)
X5: Gunning ma Roses
X6: Zero´s second revival
X7: AXL = FAIL
X8: PLOT TWIST!
CM: RPG´D
Xtr: Cyber
Xtr2: Berkana = First female Megaman villain

[Satoryu]

X1: Zero dies
X2: Zero is brought back
X3: Zero is playable, but ultimately useless
X4: Zero asks what he is fighting for
X5: Zero dies, again
X6: Zero brings himself(?) back to life
Xtreme1: Zero becomes a special weapon
Xtreme2: Zero is required to get the REAL Ultimate Buster
X7: Zero becomes Solid Snake
Command Mission: Zero starts smoking pot
X8: Zero gets a haircut
MHX: Zero missed 5 points

[Align]

X1: Solid!
X2: Lame.
Xtreme1: Annoying.
X3: Z-SABER!
Xtreme2: So satisfying, man.
X4: ANIME!
X5: Needless complexities
X6: Very rough gem
X7: ???
X8: Modernized

[Jericho]

X1 - Crazy scale. (At the time)
X2 - Best. Buster. Evar.
X3 - Z-Saber rapes all.
X4 - Voice overs.
X5 - Awesome remixes.
X6 - So broken yet so [tornado fang]ing fun.
X7 - Skip.
X8 - Hit or miss
CM - Awesome art & characters.
MHX - Day of Sigma.

[Musashi-COM]

X1 - "NO FOOT PART" RUN
X2 - X saga's MM2
X3 - UNBALANCED
X4 - Zero is for wimps
X5 - THE END
X6 - ...I said "the end"
X7 - TRY AGAIN
X8 - Nicely done
XCM - DONT!
MHX - Needs some polishing

[Acid]

Mega Man X - The first Mega Man X
Mega Man X2 - The second Mega Man X
Mega Man X3 - The third Mega Man X
Mega Man X4 - The fourth Mega Man X
Mega Man X5 - The fifth Mega Man X
Mega Man X6 - The sixth Mega Man X
Mega Man X7 - The seventh Mega Man X
Mega Man X8 - The eighth Mega Man X

[The Great Gonzo]

X1: YOU'LL SOON BE REUNITED WITH YOUR DEAR ZERO/boco
X2: X-Hunters more like X-Gimps
X3: I can't beat a single stage
X4: Megamouse X
X5: CURSE YOU SQUID ADLER
X6: [tornado fang]ing descending ceiling!
X7: Blurgh
X8: I finally get to play this on Christmas
CM: I'm on to you, "Spider"
MHX: Is it just me, or does Vile Mode only have one stage song?
Xtreme 1: "How dare you defeat my buddy!"
Xtreme 2: Berkana's the only one anyone remembers

[Flame]

X7: Zero becomes Solid Snake

I red this, and started laughing really hard. God, Its true! Why didnt I notice before?

[Elpis TK31]

ALL

[tornado fang]ing brilliant, I laughed hard especially the "becomes a special weapon" one.

For me, it's all about Sigma (except X3)
X1: My lightsaber is bigger than yours
X2: Electric Spark
X3: Doppler has a sexy beard
X4: PREPARE TO BECOME SPACE DUST!
X5: Going cameo on your ass
X6: Resident Evil, then T-800
X7: first Rainbow-y, then HUEG
X8: Satan never looked that handsome
XC: Smiling walljumps
XS: BATTEL ARMAR
XCM: God Hitler...uh Redips
IHX: Lots of evil laughter

[Blaze Yeager]

X1:True Beginnings
X2:Revenge of Sigma
X3:Dr.Doppler's Attack
X4:Repliforce Attacks!
X5:Sigma Virus
X6:Zero Infinity
X7:Downfall of the Irregular Hunters
X8:Sigma no Saigo!? & Lumene's Betrayal
XCM:CINNAMON!!!
XXtreme:Fight against The Irregulars again!
XXtreme2:Battle the Witch & The Forgotten Knight!

[Rue]

X1/MHX: Perfect
X2: Excellent
X3: Mediocre
X4: Overrated
X5: Underrated
X6: Decent?
X7: Experiment
X8: Enjoyable
XCM: Fun

[Kit]

Every MMX ever:

Gay.  LOLJK

[Hypershell]

X1: Zero kicks ass.
MHX: Zero doesn't let you push his friends around like that.
X2: Zero kicks even more ass.
Xtreme1: Zero does nothing without a chip.
X3: Zero lost his saber wave.
Xtreme2: Zero got the girl.
X4: Zero lost the girl.
X5: Zero lost his boss explosion resistance.
X6: Bosses have nothing to fear but the Z-Buster itself.
X7: Zero got a fanboy.
X8: Zero needs Rogaine.
XCM: Zero got Treble Boost.

Or:

X1: Pink Charge.
MHX: SIGMAAAAA!!!
X2: How to do Double Charge.
X3: How NOT to do Double Charge.
X4: INFINITE TWIN SLASHER!!!
X5: Dude, where's my Stock Charge?
X6: Real men use Shadow Armor.
X7: If this doesn't make you use the Mute button nothing will.
X8: Camera-shy Armor.
XCM: What the hell is Cannon Driver doing with my buster?!

[Flame]

MHX: Zero doesn't let you push his friends around like that.

He faits for hees frends

[Elpis TK31]

X7: If this doesn't make you use the Mute button nothing will.

True story.

[borockman]

X1: Chill penguin
X2: Mutilation
X3: My first X game
X4: SUPER NOVAA
X5: Up up and beyond!
X6: Ninja ahoy!
X7: Code Crush
X8: Paradise Lost!

XCM: Nana's chair

[ViperAcidZX]

Mega Man X: Awesome
Mega Man X2: Just as good
Mega Man X3: Z-Saber FTW!
Mega Man X4: Girly (English) sounding X... >_>
Mega Man X5: Noooo.... *cries after Zero's death* T_T
Mega Man X6: RAGEOUT!
Mega Man X7: Meh... :b
Mega Man X8: 

[CyberXIII]

MMX1:Siggy gets fed up with meatbags.
MHX:Siggy gets fed up with meatbags REMIX
MMX2:Return of Siggy
MMX3:Siggy calls in Doppler Radar
MMX4:Siggy dupes an army of idiots.
MMX5:Siggy drops a colony on a planet.
MMX6:Zombie Siggy.
MMX7:Siggy dupes another army of even bigger idiots
MMX8:Siggy makes a successor.
MMXtreme: Siggy makes a retro comeback
MMXtreme2: All Siggy wants is YOUR SOUL! AH HA HA HA.

Or:
MMX: A hero is made
MHX:A hero is made REMIX
MMX2:A hero revives his friend
MMXtreme:A hero saves the world's largest collection of pr0nz. (Proof: http://stardroids.net/wordpress/?p=747 )
MMX4:A hero starts getting less important than his buddy.
MMX5:A hero is replaced.
MMX6:A hero gets rid of his replacement and gets a cool sword.
MMX7:CRAP.
MMX8:A hero kills a devil and the angel that the devil created.

[Rodrigo Shin]

X1: [tornado fang]ing awesome
X2: Boring
X3: Better than the last
X4: Mega Man Zero - The Prequel (and more fun than that entire series put together, but overrated still)
Xtreme: The halfassed revival
X5: Weak cash-in of Nightmare Alia
Xtreme 2: What Xt1 should've been
X6: Broken yet better than X5
X7: Tragedy and disaster
X8: Meh
XCM: [tornado fang] YEAH

Haven't played MHX yet.

[Flok]

MMX1: Cool story bro!
MMX2: Incredible sequel.
MMX3: Underrated, hard but fair!
MMX4: The best. Short but great.
MMX5: Overrated!
MMX6: God's sense of humor.
MMX7: -TBP-
MMX8: -TBP-
MMXCM: Evolving lore.

[Mirby]

X1 - lol headband Dr. Light
X2 - Eat Shoryuken, Virus Sigma!
X3 - Dash up, dash up, oops fell in a hole...
X4 - WHAT AM I FIGHTING FORRRR??!?!?!?!?
X5 - Do the bosses cover Live and Let Die?
X6 - SPIKES!?!?!
X7 - Introducing AXL!!!
X8 - Hey, it's 2.5D Megaman, and it's fun!

Xtreme - Hmmm.... cool!
Xtreme2 - SOUL ERASER!

XCM - Someone put RPG in my Megaman X!

[Trask]

X1: Hadouken
MHX: Vile Mode
X2: Double charged buster
X3: Neon Tiger/My Michelle
X4: You're about to become space dust!
X5: X vs. Zero
X6: Sabers!  Thousands of them!
X7: BURN!  BURN TO THE GROUND!
X8: Sigma's grand finale
XCM: Hyper Mode
Xtreme: 8-bit revisit Pt.1
Xtreme: 8-bit revisit Pt.2