Now let's not make WaW sound better than it is.
Yes, it's a really good game. Possibly the last good Call of Duty game as of yet.
But there are downsides to it of course.
Bouncing Betties can't be avoided by crouching/proning, the only way to avoid one when you've activated is to turn around and run back around the wall. You will succeed with that about 5& of the time or so.
Juggernaught is really overpowered. Even in Hardcore it can take quite a lot of bullets to kill someone who's using Jugg.
There are a few things I don't like about WaW.
Other than that it's great. The gunplay is awesome, the game is smooth overall. It feels almost exactly like COD4. Just a little bit improved.