Wow, only 6.8 GB of data (the size of a Xbox 360 disc) out of 40 GB in total? I knew this would happen. If game developers stopped their lovefest with cinematics (maybe I'm just old but after over a decade, they don't impress me anymore) then we might probably be able to switch to flash cards as a storage medium for home console games in the near future when flash gets cheap enough. Which would be my wish. I'm not a fan of optical media. Optical drives are behind the cause of lower console lifespans, flash runs a lot cooler, faster loading with flash, flash is more reliable, etc. Blu-Ray only encourages more and more "is this a movie or a game ffs?" scenarios like this. Crysis in-game graphics are amazing and superior to what's available on consoles and that is only on one DVD right? You don't need to use that much space to deliver a Next Gen experience.
And lestat good point, wrpgs are guilty too of this. Mass Effect 2 is on 2 DVDs and that is no doubt due to cinematics.