I played it for a bit on Friday night.
Only got to rank 13 or something , so playtime has been limited.
Movement is decent, gunplay is fine.
Very good hit detection.
Not seen or hearing a lot of bugs (which is unusual for a cod at launch).
Weapon leveling and progression is well balanced imo.
Not too stingy or generous.
Old school prestige system, love it!
The maps seem alright, I don't hate any of them yet.
Quite a few seem small/medium, which doesn't bother me.
Best play is back.
Perks are fine.
Don't really have a bad word to say about it.
Only gripe is that stupid top3 winners circle thing at the end of matches.
I think Treyarch have done a good job here.
Until I play more and find annoyances etc, I think there is nothing wrong with it.
The connection has been totally fine as well.