Bethesda are among the worst programmers in the gaming industry. I really have no idea how they get away with their bug-filled, unpolished games.
Knowing that, we know they type of performance and results they get from the most powerful platform around, the PC. It's quite obvious they're a bit too dumb to do something good on a less powerful platform.
But then again, we all know this is unrelated to hardware, like most third parties.