Peronally, I think Bioshock looses its zeal about halfway through, it just gets repetetive after a while.
Great fun at first, until you realize that all enemies are basically the same and all the levels are very similar. The story is good and well narrated though, and the gameplay is fun and easily learned, so I'd give the game a solid 8.0 myself.
Mass Effect I've never played, but I've yet to be disappointed by a Bioware game! Besides, as an RPG, it's bound to be both more diverse and have better replay value than a shooter.







