From worst to best (though I like them all, mind you)
11. Resident Evil: Survivor
10. Resident Evil: Dead Aim
9. Resident Evil 1 (PSX)
8. Resident Evil 3
7. Resident Evil 4
6. Resident Evil: The Umbrella Chronicles
5. Resident Evil: Revelations
4. Resident Evil 6
3. Resident Evil REmake
2. Resident Evil 2
1. Resident Evil 5
EDIT: I'm definitively buying REmake HD.