I've been around and played RE since the release of the first one and I love the horror setting and real zombies of the first 3 RE games on PS1 but the I never had as much fun as I did with RE5.  RE2 would be my next fav.

RE4

RE 2 was the most shocking for me.

Also the original styled "tank control"games have more votes than the new over the shoulder

Since I have no strong favorite I'll say RE6 just because no one else will.

I really enjoyed the Outbreak series. It wasn't perfect but it made me feel goddamn dread and horror when I was low on supplies, low Health/poisoned, chased or with no idea what the fuck to do. With the improved online we have now, it would be really fun with 4 player co-op. I think an HD remaster, at $30 for both titles would be great.

RE 1. I'm such a sucker for the originals. Although I've sunk countless hours into RE5's online Mercenaries

Resident Evil 4 closely followed by RE 2

I like 2 and 0, but my favorite is 4. My least favorite is 5.

I've only played Revelations.