For me da drought 3 was pretty much all hit, but yeah carter 3, the album that just came out, is definitely pretty patchy.
I don't even think its right to compare nas to little wayne, they both operate in hugely different territories. I think one thing that stands Lil Wayne apart from everyone else is that where they're all about reality, his life has never been anything but unreal. What age did he get signed at, like 9? It doesn't surprise me that the man is a drug addict with a totally warped view of things, I know i'd be if i'd spent my formative years on the road.
His metaphors are like no one elses, totally surrealistic without being try hard, and his rhythms are amazing, the man has a sense of timing that is all his own.