Call of Duty: Black Ops - what do you think so far?

Some of you probably went to the midnight openings. Some of you will be picking up today. Some of you will already be experts on the multiplayer. For everyone who has copy then, what you think of Black Ops so far? I haven't got a copy of the full game yet but a play at last night's launch party suggests the action is polished as ever. It all felt very familiar though... Anyway, what do you think of Black Ops so far?