Bioshock, Arkham Asylum, Mass Effect - most of the big name Unreal engine games look pretty good. It's only Epic themselves that make generic fat space marine games.
Bioshock 1 looked good for its time. Bioshock 2 looked like poop for its time.
Mass Effect 1 same as the latter. They took no time to develop art, every wall was the same textures, everything in the game was the same. The only reason to keep playing the game was the writing. I am not sure how you can name it as a pretty good looking game at all. The only thing they did remotely well was charater models. Look at the ground, the cieling, the walls, omfg the planet surfaces. The game was outdated looking before it even was released.
Arkham Asylum did an excellent job with their looks because they spent time on the art.