Loved the game
Now bare in mind that I played (RE2 RE3 RE:CV RE4 and RE5) watched a friend beat RE1 and REmake.
So here's my review for what its worth
Leon's campaign is creepy, at least in the first couple of chapters. Had the best atmosphere imho. The story was great. And of course it has zombies

(9/10)
Chris: Capcom obviously didnt want to focus on Chris in the is game thus the campaign lacks a descent story. But I love the fact we get to see the BSAA in action. Ironically the creepiest section in the game imo is when we had to find three keys in Chris's chapter 4. (8/10)
Jake: Loved the fact Sherry is back and what I loved even more was that she has to partner up with Wesker's son. William Birkin (her father) worked with Wesker. Jake and Sherry's relationship was awesome. Jake's melee attacks were great. (8.5/10)
Fourth Chapter: This secret unlockable chapter is probably my favorite. Wont spoil anything even though most of you probably know about it. It has the best puzzles in the game and heavy on stealth, action, and more. (9.5/10)
Mercs. To me Mercs was flawless even though Im aweful at it but its just pure fun. And having fun is why started playing video games (10/10)
AI: I remember a reviewer once said that great games can stand on single player alone. Thankfully the AI in this game isnt annoying and extremely helpful (specially if you upgrade it) Not once have the AI annoyed me. They dont die or run out of ammo and of course they dont abuse your herbs/healthspray. (9/10)
The controls were great my only issue was the camera but didnt really bother me that much. The camera is exactly like it was in RE5. Aiming improved massively. Love the quickshot mechanic. Melee improved (not that overpowered if youre playing on higher difficulty). (8.5/10)
Overall 9/10 (not an average)
I know my English is far from perfect so please excuse any grammar mistakes.