Disagree. I find RE5 to be good in solo and even better in co-op, especially once you set control schemes to one that allows you to strafe and you know how to manipulate your partner well in the former mode.
Res Evil 6 has been my favorite (so far) and probably for the reason most didn't like it: It was a lot more interactive, action-wise. I've watched a review for 5 today and it appears to use the same recipe that 6 did.
Aside from that, 6 had a lot of different locals and teams that you jumped back and forth between. Also felt that 6 had the largest variety of enemies.
I'm installing Village, right now, which appears to be action-heavy as well.