User blog comment:G0LD3NF1RE/Dawnguard encounters issues with Playstation/@comment-4976111-20120831191706/@comment-3202167-20120831205421

It has WAY more interaction. And while not as big as Skyrim it is far, far more detailed. And the levels are not one hole in a cave for example, but much more detailed and complex.

The problem is a Bethesda is just incompetent with the PS3. Hell, they probably designed their engine around the 360 only.