This is Joss Whedon at his best.

Rating: 10/10 (14 April 2019)

(Pre-Endgame MCU Rewatch) Everything works in this film. The initial 'gathering' of heroes, the animosity and discord between the various characters (in part amplified by Loki), the chemistry between Stark and Banner, Coulson fanboying all over Cap, and the eventual bonding together for a common cause. I feel like everyone is bringing their A-game here, Ruffalo stepping in for Norton and doing an excellent job.
The story and pacing is good and even the action scenes are not confusing (a la Transformers) and really spotlight every single hero and their unique abilities. Their interaction and teamwork is great. The only nitpick I could have is Cap's costume still looks a bit outdated even with the upgrade, just reminds me of that really bad '90s movie.