You have some really nice models here. The Hulk play blast looks great! Just gotta put some brick walls in his way, and have fun with some Particles sims
Anyway, as for Spiderman. I think if I were going to build the Webbing on his suit separately. I would do it in ZBrush.
I would use masks to do it (Hold Ctrl and paint) I would paint all of the webbing on his suit with this method, then simply extract the mesh. Obviously this would result in a HI-Res mesh, but it would be allot faster than modeling the webbing separately in Maya.
Anyway, the only thing that I can Crit on for most of your model is probably the Anatomy. It's getting better with each model, but it still seems odd in some places. Like the back of the Hulk.
Anyway, Great work!
"Your weapons are no match for ours! People of Mars, surrender!"
"Um, this isn't Mars. This is Earth."
"Earth? Earth-with-nuclear-weapons Earth?"
[long pause] "Friend!!"