Scott Mendelson from Frobes ranked all of the Marvel Super Hero movies (since 2008 I believe?), including Civil War.
http://www.forbes.com/sites/scottmen.../#658e8de52acd
His rankings are as follows:
13. The Incredible Hulk
12. Iron Man 2
11. Age of Ultron
10. Iron man
9. Ant-Man
8. Thor the Dark World
7. Thor
6. Captain America: Civil War
5. Captain America: The Winter Soldier
4. Iron man 3
3. Guardians of the Galaxy
2. The Avengers
1. Captain America: The First Avenger
I disagree with most of the list (Iron Man 3 at 4?!?), but that is a different discussion entirely. What I did find interesting was that he ranked Civil War behind the other two Cap films. Early returns have it at 97% on RT and 85% on Metacritic.