Quip after Quip after Quip. (I'm joking but that's basically what it was. good movie though, the avengers.)
GoTG or Winter Soldier bettered the marvel experience more in my opinion. the first one works as its own thing, while avengers was a pay off for series of movies. winter soldier was a captain america sequel done correctly. it didn't try to emulate what made the first movie work much, focusing on different scenario.