Originally posted by Batroc
I suspect the reason for this is that Marvel thinks it looks cool to have panels of the Hulk bleeding all over the place. They probably think it's what the fans want to see and that it makes the books more 'mature' (i.e. violent).
McFarlane opened a whole can of worms when he had Wolverine cut the grey Hulk. Before this the Hulk had unbreakable skin and was just plain invulnerable, but now it's all 'healing factor this, healing factor that'. And of course if Wolverine can cut the Hulk, he's gotta be able to cut the Thing and everyone and everything else.
I wouldn't bother looking for theories about how the Hulk being cut since the 80's means he's weaker or less vulnerable. I presume that in the silver age they couldn't show characters getting their eyes slashed open, etc.
Gamma Corps #3 Showing wolverine cut hulk during there first encounter.
