Resident Evil 5 was exceptionally fun IMO if you had/have a permanent partner that will do the entire run through (and subsequent run-throughs on harder difficulty) with you and if you don't give a flying shit about it not being a "traditional survival horror" game.
I'm sad to hear that 6 is generally thought of as a bit of a mess, but I'll probably play through with the same guy that I did RE5. I'm sure we will get the most out of whatever is there, and if the game turns out to be sub-par overall, there's always next time ... because Capcom ain't gonna give up making Resident Evil games any time soon.