Originally Posted by Chewy
I honestly have no idea why anyone thinks all of the Guardians will be showing up here. It makes a heck of a lot more sense to introduce a single new character in Avengers 2 than in does to take a half dozen characters from the Guardians movie and stuff them into Avengers 2.
I think a lot of the audience for Avengers 1 didn't necessarily know there was an actual team of the same name but thought Marvel were merely combining all their heroes into one big event movie and calling it the Avengers. This is even more the case in he UK where the film was called Marvel Avengers Assemble. Substitute the word Heroes for Avengers and you'd think it even more.
So having all the Guardians team up with the heroes from the first film will make the audience think that Marvel are just teaming up more heroes and that the Guardians are now part of the same team.