Like it or lump it, but getting to market first, and getting the market share it did, the 360 locked most games into DVD level of content or less. Sony titles such as Uncharted 2 will use the BR of course, but most multiplatform games - with the probable exception of RPGs, will stick to one DVD of content.
If that means less textures, more compressed textures or whatever that's what you're going to get.
Simple market economics and realities. Sony will of course push titles with more content, such as Uncharted 2, and where the game needs multiple disks, such as Rage or FFXIII, then one BR disk will be used more effectively.
Just the way it goes.
Try to be reasonable... its easier than you think...