With all the the residual hype around Endgame, Infinity War, NWH, GOTG: Vol. 3 and other MCU movies, I feel like the original is not getting the credit it deserves. It laid the foundation of the entire universe in such a fantastically executed manner and IMO is clearly the best Avengers movie. Endgame and Infinity War aren't particularly close.
Still a top 3 MCU movie