Which Marvel characters have experienced the most radical power creep?
Of the top of my head:
Wolverine: The guy has gone from struggling to heal bullet wounds to being more of a single cell organism.
The Hulk: Since he's gone World-Breaker, it's been upwards and onwards since then. Seeing someone like The Thing even fight him for more than 5 minutes now looks odd.
Venom: He's gone from being a little stronger than Spider-man to full on god now.
On the other hand, we've seen some guys get nerfed. Some like:
Iron Man: This guy could go toe-to-toe with almost every Earth based superhero in the Marvel universe before. Now, everyone it seems can damage and tear up his armor.
Spider-man: In his current run, Parker seems to get his ass kicked by everyone.
Moon Knight: This guy was superhuman before but now he seems to just be well trained or something.
Thor: He's supposed to be infused with the Odin force, but he doesn't seem to able to use it.
Black Panther: Writers seem to have forgotten that he's an enhanced human.
Gambit: This guy used to be fast enough to block bullets with his staff, now he gets kicked around by everyone.