The list that was posted showed a bunch of titles hovering around the max capacity for the 360 DVD, it may be pure coincidence but it´s more likely that it´s the small space that simply sets limit to how much space a game can take. And without really knowing the inner workings of textures on the different platforms isn´t fair to say that the assets that are used on one platform would take more than just "better resolution" in order to be used on other platforms with plenty of space. Simply because alot of work goes into fine tuning the textures for the exact space they can take up. And secondly there is more to better textures than just the resolution. You need a engine that can take advantage of the higher res as well as the power to drive that engine.
But would anyone in here really suggest that if there was more space on the 360, like 25GB it would not have made any difference what so ever on the games? both in terms of content and quality? not to mention game design.
I bet that if this was a discussion about CD-ROM vs DVD games on the PC platform there would no discussion