The reason Bruno Mars is awesome is because he doesn't use autotune (Or he doesn't use as much autotune as the other singers). He actually uses his real voice. I mean, when you compare him to the Black Eyed Peas... geez. The Black Eyed Peas abuse autotune so much.
His songs are also a good variety. It's not just all love songs, like the Lazy Song. It's just... chill.
Bruno Mars is awesome!