I don't really want Hawkeye or Black Widow to die, but good god do they ever have absolutely no place in the Avengers. They're fine in other people's stand-alones, like Widow in Cap 2, but when the Avengers assemble, those two are so dramatically out of place. You've got a giant unstoppable green rage monster, an asgardian, a guy in an incredibly sophisticated suit of powered armor, and a dude who who is jacked up on super serum.
Then you've got a dude with a bow and trick arrows, and a chick with a pair of glocks.