Honestly.... The Battlefield series has nothing to worry about.
This is going to be a jump bunny/sniper(railgun)/twitch fest.
There is no endurance so go ahead and jump all over the place like crazy, and run full speed while doing it.
Vehicles have a horrible 'bumper-car' feel to them. It feels extremly clunky and unrefined after playing BF2 and 2142.
While there are huge outdoor levels, the one in the beta is very blah outdoors, but I will say that some of the interior spots are a nice change from the BF series of hallway-room-hallway, but QW has it's share of really big empty rooms.
FX and Sound: Well the sounds really need to be beefed up, and the hit detection sounds from Quake 3 need to go away. I was shooting the ATV (called a Warthog) and it was making some sort of.. well.. pig noise.
FX wise it looks just as bad as in the Nvidia 8800 video that was released.
Vehicle damage is actually kinda cool, but overall I don't know how useful it will be. Example: I blow off 2 tires (left side) of the ATV I can still drive it but with very limited control. And I didn't get a chance to play with the air vehicles.
Class System is actually really nice as it gives people a purpose to be on the battlefield.
But overall I don't see myself getting this unless they really tweak some of the more glaring issues.