As hard as it might sound, I think this guy speaks the truth for most part. Ever since X6, the series has been somewhat deteriorating and strayed a lot from it's original formula. Had the series ended with X5 as Inafune originally intended, there would be no complains whatsoever (except as Hypershell loves to point out, the [tornado fang]'d up powerup system in X5) but no, they lengthened the series and thus threw in a lot of unnecessary stuff which only confuses players and changes characters for the worse etc.
Like stated in that comment, X had quite a few changes of heart within the X series and it gets a little confusing to guess what exactly is going on in his head. We all know X is a robot that suffers like a human being. The entire human VS Repliroid conflict is a gigantic dilemma for him. That's why after the many battles and tragedies he's experienced from the beginning of the Irregular Breakout up to the Nightmare Incident, he decides to quit on being a frontline Hunter. He can't stand battle anymore and instead tries to somehow resolve this conflict in a way that does not give further birth to violence and death. After that episode however, this exact emotion kinda gets thrown out of the window again, as in X8 and CM, he appears to be this battlehardened war veteran who apparently doesn't have any doubts anymore and just does his job, as well as throwing out Irregular claims left and right. What exactly happened here? This is a behavior I might except from Zero at most, but X? And how exactly is this supposed to reach the point after the Elf War, where X comes to the sad (?) conclusion that he doesn't care about fighting anymore?
I agree with the statement that Axl was kind of an unnecessary addition to the series. Yes, it might have been with best intentions in mind to bring a breeze of fresh air into the franchise, but the impact that Axl had on the entire story of the X series was a downright desaster and shifted the focus too much on other things instead of what was necessary, though I DO agree that the entire stuff Lumine keeps babbling about (as Mr. Gilbertson stated) was quite interesting. Thankfully, they put Axl on the sidelines again in the ZERO series and focussed more on the actual protagonists of the series again, X and Zero. Sadly, they threw in another pair of new characters and an Axl Live Metal in in ZXA instead of focussing on the already established characters Vent and Aile.
Regarding Zero, I personally don't think that the impact of Iris' death doesn't need any further reference in later parts of the series. This isn't Gundam SEED, flashbacks regarding character deaths aren't necessary. That is of course, unless you've played everything from X6 forward, but not X4. To me, Zero's entire behavior is a reference on how killing Iris influenced him. He's become colder, sterner and more reclusive to those around him. He's shut the door to his heart because he does not want to experience that kind of pain again, or end up in an emotional dilemma like X does every so often. And that, in my opinion, is a crucial element. Zero is the counterbalance to X. When X is in a crisis, it usually is Zero who stands up and gives him a good punch in the face in order to snap him out of his depression and tell him what they are supposed to do: Fight. For their own beliefs. Against destiny. To grasp the future. X is the one who is supposed to usher the inhabitants of the Earth, both humans and Repliroids, into a new age of peace and acceptance and it's Zero's task to remind him of that when X is down. That's why they are the best partners. Yet, deep inside, Zero does wish to stop fighting like X as well. We see that in his X8 ending. While returning to Earth, he reminds himself of Lumine's words and secretly hopes that Sigma won't come back so that he can finally lay down his arms.
As for the issue this guy has with Layer becoming romantically involved with Zero, I don't really see a problem here. So Layer does have a crush on Zero. Big deal. So do Ciel and, in a very twisted way, Leviathan, but Zero doesn't care. He's doing what he's been doing ever since: fighting. Fighting for what he does believe in, and I don't think that in either states (X series and ZERO series), romance has any value for him anymore, at least not during these precise points in the respective stories.
The Wily issue on the other hand, I agree wholeheartedly.
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Would I want another X series game? Surely, because as the series is now, it simply lacks any proper conclusion. But my fear is that they simply won't be able to make one because the situation is quite difficult, to connect Command Mission to the Elf War that is. Plotwise, it might be possible, but gameplaywise? I think not. There's too much politics involved later on.