14GB for this very stripped down beta. LOL @ megatextures.
It's pretty obvious this game is made for the console first and foremost. The need to make it playable with a controller just smacks you in the face so hard. No twitchy aiming (which you'd only have with a mouse), no bunny hopping or rocket jumping. Movement, while a little faster than Doom 3, is not as fast as it should be (much faster in id's old games).
But given that the multiplayer is made by another company made up of ex Halo and CoD developers, it's no wonder the MP of Doom blows this much ass. It all makes perfect sense. Made for a console by devs from the two FPSes that watered down the genre so bad.