Almost everything in phase one(except maybe iron Man 2) is near perfect. Literally the foundation of everything coming out these days, Captain America was excellent, why would you imagine that Captain America wouldn't be a pro America propaganda film? Lmao it's Captain....aaameriiiicaaaa.... Lol movie was so on point that the DCUs highest rated film was a direct rip off of Captain America. Directed by a legendary Hollywood mainstay in Joe Johnston. It was a perfect introduction for a man from a different time who would then play the fish out of water in future films.
Iron Man was near perfect(still the best iron Man movie) the incredible hulk with Norton is The Best banner, best hulk we ever got(outside of CGI quality) the avenger imo is still the best avengers movie, you can watch that movie without watching 400 movies and it makes sense. Infinity war and end game are fan service cluster fucks of movies that if watched by someone who's never seen a marvel movie they'd think they were having a mild stroke.
My all time favorite MCU movie is still guardians 1 but after that it's hit and miss for me.