Of course they can, most (if not all) major games these days send stat packets back to microsoft/Sony and/or the game devs/studios, containing all kinds of what they commonly refer to as "Non Personal Information", which they can use as part of development for future games or potential sequels. In fact many games, such as EA titles like the Mass Effect games have their own seperate 'privacy agreement' type popup that you agree to before you can first play the game. If you read through it this gives them specific permission to collect such 'Non Personal Information'. It usually goes along the lines of:
The only way to avoid this happening is either opting out and declining your console's (and/or game's) privacy policy - which then means you can't actually use the machine/game at all until you do click 'agree', or by not being connected to the net at all, so the data packets can't be sent. Otherwise, they know what you are playing, how you are playing it, and how often.
Welcome to the information age, eh?