Resident Evil 3 lower than 5 and 6? 5 is pretty much unplayable on single player and 6 is...yeah, less we say of it the better.

5 gets some leeway because Albert Wesker is pretty good villain. 6 takes away the horror and ramps up the goofy silly stupidness and action to absurd levels, I'm Glad 7 toned it down a notch.

3 has Nemesis, quite possibly the most terrifying boss in Resident Evil.