Had some lagging issues during the day, but it seemed to get better as the day progressed. Just typical crap that always goes on the first few days with new release games.
Likes - I'm perfectly fine with the weapon selection. I like some of the new killstreak stuff, like the RC-XD. I like how you can vote on the next map selection. And I love all the maps so far. They all seem pretty large, and complex. Lots of places to hide, rack up kills, etc. To me the complexity of the maps make it more tactical, and strategy based, like it should be. Just makes it seem more realistic. Knifing/melee is more realistic. You really have to be sighted in on your enemy or you will miss them. I put this in the likes, because some chode flying 15 ft across the screen in MW2 to stab you, wasn't realistic at all. I like the contract things. It's just a gimmick to earn more points, but I like that they put a time limit on time allowed to complete it. I like that it's full 1080p. MW2 was only 720p.
Dislikes - I don't like that I can't have a red dot sight and noob toob, masterkey (shotty), or flame thrower on my AR. They do have what Infinity Ward called the Overkill perk, Treyarch calls it the Warlord perk. Allows two weapon attachments to primary weapons, but it specifically excludes all the under mount shit. Ghey. My eyes are too shitty for plain jane iron sights these days.
All in all, so far, I must say that I like Black Ops a hell of a lot better than MW2. That said, it will likely change once the glitchers figure things out. Bunch of brokedick queers that have to cheat at games piss me the fuck off.