RE2 is my fav.
Then resident evil code veronica, followed by RE4 and RE1 rebirth.
And of course, the worst RE for me are RE5 and 6.
The 5th is just a bad copy-paste of Re4 with useless coop, and the 6 is too long, with many useless characters and bad coop.
Yeah. In RE4, you was mostly alone all the time, and when you was with the girl, she was useless and you needed to protect her. In RE5 and 6, you'r never alone, and i really don't like that.