All I've done so far is playing singleplayer campaign... 2 Missions left and it will be at an end.
For a singleplayer campaign (or multiplayer co-op also) I think it is actually really fun and the story is good an engaging IMO. Maybe not groundbreaking storytelling or anything like that, but if you put it next to Battlefield 4 campaign it's deserving of an award
I didn't play any of the other previous black ops games so maybe I didn't have my expectations built up like other players... But so far I am having a blast. Just wish the campaign was longer... will probably play through it again on harder difficulty and online co-op. Was a pleasant surprise because I was nervous I would regret purchasing this game after reading so many mediocre reviews on the game.