Don't hate the playahs, hate the game: At Grotesque Anatomy, John Jakala hilariously reviews Avengers/JLA as if it were a video game:

"At first it appeared that Avengers/JLA would be either a platformer (collect all the artifacts!) or fighter (I've always wondered if Superman could beat up Thor), but in the end it's a simple melee brawler: In order to save the universe, you have to battle through wave after wave of increasingly powerful villains until you reach the Big Boss himself - Krona! The developers have planted plenty of rewards along the way in an effort to keep the game entertaining, but, as noted earlier, the desirability of these bonuses in undermined by making them so random. Players are unable to save costumes or characters, so they're often gone as soon as they were unlocked. There are also problems with the consistency of power levels: At the very end, it's possible to destroy Krona's big cosmic doohickey sphere thing with an arrow. I don't know if this is a bug in the game, or if one of the developers just had an overly sentimental soft spot for archers."