First, my sympathy goes out to PC gamers who have to suffer through massive bugs, crashes, and glitches to get their version working, if it will even work at all.
Note: I have played only the xbox 360 version and not played any other version.
It's more Call of Duty. These games have become a bit of aquired taste. If you hated COD after 4, stay away. However, if you hated Modern Warfare 2 for its story and crap cheap tactics in MP, but would've enjoyed MW2 otherwise without those cheap tactics. Black Ops is solid. I don't think the game is as bad as the haters would like you to believe.
My experience has been mostly good. The problems are in the multiplayer, but aren't crippling on the 360 version. Matchmaking puts you in some games that in which your team is kicking ass (which is fun). Other times. I got put into a headquarters match where my team is losing 225-0 several times in a row. Still, you can adapt, and the streak of bad games will end. Also matchmaking didn't work last night for anything including zombies. Basically, it was like no one was playing online. This is Call of Duty, so cleary there is a problem with the matchmaking. Finally, the spawning needs some work (looking at you Nuketown!). But you can take advantage of the bad spawns on nuketown and score some easy kills if that's up your alley. The graphics on a couple of the multiplayer maps looks less than stellar.
Once you get past these negative points, the game's very good for what it is. It's not gonna deliver a deep story. It's simply a fun video game experience that won't take hours to figure out. The campaign is probably the best since Call of Duty 4 which isn't saying much, but it's still very fun. I'm currently going through the game on hardened and scooping up achievements among the way.
I must say I love the combat training. Great addition that lets you actually test out the later killstreaks. Very full featured too, which is nice. The Zombie mode is just awesome. The chatter from JFK, Castrol, and Nixon is actually pretty funny. And the game looks mostly stunning and sounds fantastic. Combat Training and Zombies are incredibly addictive and aren't the main parts of the game:o
Those are my impressions of Call of Duty Black Ops. Activision's business model is rather annoying and the gameplay should see some kind of change, but the quality of the content on the disc is top notch.