5 was my favorite (absent from your list) then I would say 4 then 2 then 6.

Resident Evil 2 was a masterpiece. It managed to improve on the creepiness factor of the first while ramping up the "thrill" factor. It's one of those rare sequels that is better in every conceivable way than the original. The soundtrack was beautiful and is still the best out of all Resident Evil games to date. (IMO at least) The "A / B" game mechanic was also brilliant and ramped up the replay factor in a way that was unheard of for a game of its kind. It was basically four games packed into one, each with drastic differences that made each play through tense and exciting. I can't wait for the remake... but to be honest I'm also a bit worried for it.

I didn't grow up with the original games. So I think they are shit personally. But I can see the appeal. I really liked 7 though.

Resident Evil 2.

Without a doubt a tie between 4 & 7. The original and all of it's remaster glory was fantastic too but I wouldn't call it my favorite. Outbreak and Umbrella Chronicles(on-rails Wii title) were pretty fun too.

7...

The only one I've played from beginning to end is 7, so that one.

I've only played RE7 and that was pretty fun despite it being short.