One of the worst to date. They took all of the fast paced elements out with the new engine. The game has slowed down and feels battlefield-esque. The game has a massive meta unbalance and is generally not enjoyable for casual and new players.
Connection for multiplayer is suspect at best. I play several online games with friends from four different continents around the world latency and tick rate and packet loss issues are fairly severe. These may get optimized later on, but unless you want to only play within you region it's not worth the effort.
Zombies is zombies. It's fun. Campaign is interesting but a bit flat.