Mostly the writing and rpg aspects so far have been at least as enjoyable to me as New Vegas, and since it has nothing to do with anything made by Bethesda the combat is a lot better and the thing actually runs without any major glitches so far.

It also is in space and is extremely critical of mega corporations and end stage capitalism so major bonus points there. Much as I love a post-apocalypse I love space and hate corporations more.