Guardians of the Galaxy only 3rd? How dare ya.
Would struggle to make my top 10, didn't enjoy it. In fact, when I watched volume 2 recently I drew a complete blank on the blue guy with the arrow and couldn't remember him from the first film at all.
Anyway for me it's:
1. Spider-Man Homecoming
2. Ant-Man
3. Iron Man
4. Captain America: First Avenger
5. Captain America: Civil War
Then the Avengers films & Winter Soldier in some order, then GoG & Dr Strange, then Thor, Hulk and the Iron Man sequels (Stark works far more effectively as the glue that holds the premise together). By the time you get to those there's no point putting effort into ranking them.