Co-op is terrible. Worst in a long time. 3 missions, all poor and some are short, with limited replay value, dumb AI, cheating AI. The last mission is 6 waves to defend and is easy to get 3 stars and embarrassingly bad imo
Multiplayer is good, definitely the best part of the package. They nerfed the footstep audio pretty bad though, you can still hear enemies but not as easily. Kinda sad about that. None of the maps are great. Some good ones, some average ones. They all feel different enough, I guess.
People are already complaining about the perk system. Mostly because they can't run ghost from the start and uav spots their asses. I honestly don't really think it's that big of a deal. You can kill UAVs easily with an LMG or the launchers, or pop a counter-uav. And if none of that is available, just assume people know where you are and plan accordingly.
Quite disappointing there is no stats page / combat record. But I guess that won't be too far away.