1.Ichigo is visible and can be hit, but does that take away the fact that his attacks target an opponents soul? Because hulk's body may be stronger then diamond, but his soul shouldn't be any more durable then our own.
2. All of these characters are speedsters by marvel standards. Without PIS i can't see how hulk would be able to lay a hand on any of them.
3. You all act like these characters are complete weaklings. Each of them are roughly on iron man's level. So i wouldn't act like these characters are so outclassed by (average) hulk.