I think all my choices are slightly tinted by my reading of the comics but hey.
Also, do not get me started on the X-Men movies. I consider this fair warning.
Spiderman 1 was great imo. I thought Toby was great as the hero, I like that spiderman wasn't played by someone who in no way in hell could look like a nerd. Ruffalo has this problem as Banner.
X-Men 2 was amazing. Average casting, great story, amazing use of the universe.
Iron man 1 was good, great casting, great action but kind of weak storyline.
Avengers 1 was great, not seen 2 yet.
Not seen GotG which I would like to at some point.
Cap movies are the worst imo. 1 was contrived and 2 was non nonsensical and predictable.
I liked Thor 1 but found 2 really forgettable, Thor smash more giants? Loki is a dick again?
Fantastic 4 movies I thought were about average, 2 was the better one imo. Fewer lines like 'Chem 1:01'.