I remember this thread... Before the Great Crash...
MM1 - Bomb Man. To me, his stage is the easiest of the lot, plus, he just jumps around with easily dodgeable bombs.
MM2 - Flash Man. Well, let's just say on the first try, I could only clear his stage.

MM3 - Top Man. No question about it.
MM4 - Toad Man. Another no questions asked.
MM5 - Gravity Man. Well, I used to start with Wave Man, but, I hate the jetski part...
MM6 - Knight Man. Very predictable pattern out of the 8.
MM7 - Junk Man. Again, another predictable pattern.
MM&B - Cold Man. Well, his stage was the easiest out of the initial 3.
MMI (First 4) - Fire Man. He's not as menacing here as in the original.
MMI (Next 4) - Flash Man. Well, again, easiest of the 4.
MMII (First 4) - No specific order. All 4 are as easy to destroy with buster.
MMII (Next 4) - Top Man. Same reason as in MM3.
MMIII (First 4) - Snake Man. Easiest of initial 4.
MMIII (Next 4) - Skull Man. Well, his stage was the only one I could clear properly...
MMIV (First 4) - Toad Man. Still same old Toady.

MMIV (Next 4) - Napalm Man. No real reason, just wanted to finish him off first.
MMV (First 4) - Neptune. Another Toady of sorts.

MMV (Next 4) - Jupiter. Space stage.