This is probably my favorite fighting game of all time. What was your favorite group to use? Mine was Cable, Captain Commando, and Iceman.

Cable ruled in this game.
Captain Commando had cool moves (especially that super where he would uppercut the opponent and all the other dudes from his game would beat on them).
Iceman's Ice Beam is one of my favorite projectiles.

well i havent played it in a while but i think it was spiderman or strider ( for air combos ), cable of course with cyclops so that i can do a huge double super.
Now that i think about it, it was probably strider because he had a second super that filled the screen so i could do a triple super and could fill a good portion of the screen.

Ryu, Cable, Iron Man.

or

Venom, Dr. Doom,  Cable.

My "best" team was the strange combination of Gambit, Hayato and Spider-Man. Not the best team when it comes to combining supers but I was pretty awesome with all 3 of them so it was all good.

My other team was usually just Cable, Jill and Iron Man and that worked out really well.
 

The team that I like to use is Magneto, captain commando for the combos and juggernaut for the assist

I used to pick cable but he ended up getting banned by my friends due to his cheapness

My team that helped me rule the dorm was Hayato,Spiderman, then I close with Rogue. Unbeatable.

Magneto, Cable, Hayata or Ryu

In the hands of a lethal player, Magneto is deadly!

two teams got me a good run.

cammy ryu sentinel

or

ryu iron man magneto

I usually tossed three Marvel characters into my roster.  That's probably due to my lack of knowledge about all things Capcom.  Though, I think I occasionally put Ryu in there, just because he's like the Sub-Zero of Street Fighter.

. . . Not literally the "Sub-Zero of Street Fighter," of course. 

Gambit, Akuma and Cable.

Venom megaman and amingo/cable sometimes iron man