Initial impressions:
+ Graphics are improved, and frame rate is excellent (huge improvement over Black Ops)
+ Matchmaking is very good. And lag is bearable on 2 bars.
+ Customization options are endless, and I really like the 10-point custom class system.
+ The revamped Menu is amazing, and the menu soundtrack is EPIC!
+ Streamlined party system. Gotta hand it to Treyarch on this one, party forming and joining has literally become effortless and blazing fast.
+ Maps are small-medium sized.
+ Gameplay is fast-paced, haven't exactly encountered campers yet.
+ Spawn system.
- Maps can get linear.
- Barrel campers. These asstards take cover behind objects, get a few kills, die. Rinse and repeat.
- Random spawns makes enemy encounters unpredictable, but this is probably because I haven't played the game enough.
That's it really. I like the game so far. I sincerely hope this doesn't become a snore-fest that Black Ops turned out to become after a couple of months.