I have trouble exactly numbering them, but today I think my ranking is:
1) Guardians of the Galaxy - Right out of nowhere, came this funny, musical film that I found utterly wondeful
2) Captain America 2 - Just a fantastic, Cold-War era spy thriller, that so happened to be set in the MCU. Very close second behind GOTG for me
3) Avengers 1 - Brilliant ensemble cast, Whedon directing and showing he knew how, very funny and great villain
4) Captain America 3 - Fantastic sequel, loved the inclusion of Scarlet Witch and Spiderman, liked the plot enough
5) Ant-Man - Paul Rudd is a comedic treasure in this, every beat made me laugh, good plot, good comedic timings
6=) GOTG2 - Little disappointed at the plot, but Kurt Russell was amazing, and very good music (if not as good as the first), along with some good set pieces
6=) Avengers 2 - Little bit confusing, didn't like anywhere near as much as the original, but still a very good film
Spiderman Homecoming - Very good film, marred by too much Tony Stark, would have preferred less of him, but still very good
9) Thor - Loved the movie when it came out, Branagh did a fantastic job of setting the world of the Gods, and best movie villain in the MCU, actually being a better villain then he was in Avengers film
10) Dr Strange - Loved the mystique, the set pieces were jaw dropping, liked Cumberbatch enough
11) Captain America 1 - Like the plot, very cool villain a little let down by the weird start and CGI
12) Iron Man 1 - This and Cap I go back and forth on, this has a worst villain, and an annoying end, but launched the MCU
13) Thor 2 - after such a good first film at the time, this was an awful mess, awful villain, poor direction, etc
14) Incredible Hulk - Got bored, fell asleep, haven't bothered to watch it since
15+16) Iron Man 2 & 3 - Just utterly awful in every respect
Top 4 are a league apart, 6-10 are all very close and each could switch positions any day, bottom 4 are terrible, 11/12 just average
Raimi's Spiderman 2 fits in around the top 5 in that list; Spiderman 1 around 6-8, Spiderman 3 just after Cap 1, and the 2 ASMs right at the borrom (maybe around 14th spot)