That may be something which works better in the comics than in the movies, however. In a single film, it can be difficult to find enough screen time for enough of an ensemble cast to make up one good superhero team and a main antagonist or villain team, let alone multiple hero teams.... heck, one of the complaints about the third Raimi/Maguire Spider-Man film was that they tried to squeeze in too many villains, and that was with a single hero!