I'm not loving that much mainstream stuff either these days. Everyone seems to be losing steam; Nas is nowhere near his early stuff, and Luda's new album, in my opinion... it didn't really stand up either. The last mainstream rap CD I really enjoyed would prolly have to be King. Well, Lupe Fiasco's Food and Liqueor too, if you consider him really mainstream.
There's still some pretty good indie stuff, though. Gym Class Heroes are still pretty beastly, but the radio has been kinda fucking them over; the only songs of theirs that are ever played are those gay little FallOutBoy cooperations.
One person I've been listening to these days is Plan B. It's interesting; hardcore raps over acoustic guitar... from a white guy. Worth a listen.
Why So Green And Lonely? We Are Accidents Waiting To Happen.