This is why I generally dislike professional reviews. They tend to be biased one way or another, either like or dislike. I much prefer gathering my opinion from my close friends, or from reading forums on various gaming sites about a game. It is a much more natural way of deciding if a game is good or not anyway, since casual discussion will bring up both the good and the bad and one can form an intelligent weighted decision on their own based on what you've heard/read.
I'm not going to bash this guy in particular, since his opinion is just that, his opinion, and doesn't mean anything to me. But it sounds like he doesn't like "Call of Duty" in general, rather then disliking Black Ops in particular. Maybe he is just burnt out on the series, which is completely understandable? I avoided MW2 for that very reason, I liked WaW and played it so much that MW2 was not interesting at all.
I feel sorry for the people who read that though, and immediately refuse to try it at all, damning Treyarch for making "another shitty game", or whatever. I personally think that the campaign had me cheering for awesome moments more then the previous CoD games, and the story was pretty interesting, I liked the whole CIA version of events. Multiplayer actually feels balanced, unlike the previous iteration.
This isn't going to change anybody's opinions either way, and it shouldn't. But still, I'm ashamed of calling myself a gamer when I see the avid haters, and avid fanboys going at each other, especially on this site. :/