I started playing the game (I've just finished first chapter of Leon's campaign) and right now I honestly don't understand all the hate the game got. It is a little bit chaotic and much less focused than RE4/RE5, but I still find it fun and quite atmospheric. What irritated me the most is how dark the game is. On default settings (20) there were moments where I could barely see anything and thus were attacked out of nowhere by zombies.
Also, I think that mouse + keyboard controls helps the game a lot. Aiming is easier (I remember having a lot of problems with it when I was playing the demo, but maybe that's just me sucking at playing shooters with gamepad) and functions like dodge left/right/back or mix herbs and put them in the inventory have their own separate buttons, so you don't have to remember all the combinations. What I hate is how you can't assign buttons to specific weapons, like you could do in RE5. Scrolling through weapons (and then scrolling through items if you want to use granade or remote bomb) is annoying.
Of to try Chris's campaign and see if I will hate the game then.