WOW!!! I really would like the Russo Brothers to direct ever comic book movie from this point forward. These guys are the best in the game and this movie is right up there with The Winter Soldier and Civil War as my favorite Marvel Universe movies. This one also reaches that crazy level of the first Avengers in terms of having sky high expectations and managing to blow them out of the water and exceed them masterfully. They managed to juggle all of these characters with awesome humor, excellent action, perfect pacing and introducing Thanos who clearly is the best villain in the Marvel movies to date. I can't go into too much details because I wouldn't want to spoil anything but all I will say is that they so masterfully kept you on the edge of your seat emotionally and did such a good job with all the different characters interacting with each other.
I would absolutely recommend everyone checking this out. It's another shining example of how Marvel's master plan really is the greatest thing not named Star Wars to happen to movie watching fandom.