You know all those times Luke fought side by side with Han, Leia & Chewie in Return of the Jedi? Oh, you don't? You know why? Because even George Lucas knows you don't put guys with superpowers on a team with mere mortals! A chick in a catsuit and a guy with a bow and a guy with a shield, no matter how much fictitious steroids are in their systems simply have no business running with a Norse god, a rage-fueled giant, and guy wearing a compact tank/fighter jet weapon. It's like those old cartoons where Superman teamed up with a bunch of lamer superheroes and they had to come up with plot devices to explain why Superman couldn't solve the problem all by himself in this episode. All a god might possibly need in the way of team-up help is a normal person to provide him with context and acculturation, not a bunch of weirdos so out of touch with normal humans that they shot up a ton of drugs or spent thousands of hours practicing archery to have something that makes them stand out enough to be considered for a freak show like the Avengers.