Beating Venom and Sandman (easily)
Before the Venom and Sandman level,make sure you have the vault jab or smash on your normal suit as you won't have your black suit.
First you will fight Sandman,as he uses a tornado to throw stuff at you,I don't remember whether it's triangle or circle but when the button comes up on the screen press it,this will throw a beer at him,and if you get the chance,take one or two shots at him while he's using the tornado,repeat till Sandman's health goes right down.
Next you'll fight Venom,this is where the vault attacks help,it may take a while(as he is bigger,better and creepier than Spider-Man) repeat until there is black worm things coming out of his back,do it again until there is a shield around him,when he is going to leap over and tear your limbs apart,jump up near New Goblin(did I mention him?)and press triangle,repeat until Venom's health go's right down.
Then you'll fight them again,i'll submit more hints about that soon,later.