I love this game and think it's the best coop TPS ever made. That said I have always found the reaction to be very interesting as there are some wild swing in how people respond to a game that by all accounts is just a poor version of RE4 which since RE4 is about the best action game ever made still means RE5 is a top tier action game.
Coop is self explanatory, if one plays solo they will have a different experience, many times a frustrating one. I played this game every way, I know how to best control the AI, always have on follow and stay close and give them the smg and that ammo, and treat them like a moving item box. If the AI ruins the experience for someone that will affect their view but that's not a real analysis of the game. So we have a bunch of people angry at the game before they even analyze the levels, the enemies, the combat scenarios, it goes to show how important player comfort is.
What I don't get is people who can play this in coop and think it's poor. Maybe it's my taste in shooters, I do not care for cover shooters. Gears is a fine series, great at many times but the whole jump behind cover and pop and shoot bores me. RE5 continues the RE4 style of making you use the environment and every shot count as your offense and defense. It's an intense kind of TPS that few games manage to replicate and if they do they don't have the variety and level design of RE5. Think of all the wild situations you are put in, the insane variety of environments, the constant stream of new enemies, new weapons, there is something interesting in every room. Much like RE4. So how can you think this game is poor?
I think this just goes to show how delicate the balance of action , level design and pacing is to a game. RE5 is slightly off of RE4 and the reaction is so wildly different. Yeah stages are a little to big, segments go on for a little to long. Bosses are a bit more puzzle like leading to some frustrating moments which are game killers to many players. Everything is off just a little and that little can make something go from greatest action game ever to a 7 or a 6 to some people, that's wild.
Anyway I love it. Loved the story, love all the quality of life changes, mercenaries is the best in the series. This is a top tier RE game to me, a better coop TPS than Gears or whatever other TPS you throw out there.