man, i think he's horrible...way overrated. he whines, tries to sing and can't, and he doesn't say anything. the only song that had a message in it is "the sweetest girl" and his verse still sucked lyrically. i'm not saying all his stuff sucks, just the stuff i've heard.
i mean i heard one today, it was an r&b song (i don't know by who) and his verse was almost the wackest i have ever heard. the only line i can remember is something like "if he won't treat you right, i won't treat you wrong". (that line's not bad, but the verse was--content, flow, everything.)
sad thing is, i listen to his crap whenever it comes on just to see how bad it is and to see if maybe i'm missing something that makes him so good.
only thing i give him is work ethic. i mean, dude's on more songs than there are days in the year, so i know he's dedicated. but, at the same time, maybe if he didn't put so much crap out, he could focus on making quality stuff, rather than spewing out garbage.
and i think artists just have him on their songs just to have him. he doesn't add anything. that wyclef song i mentioned, i love (and i mean love--i think it's a GREAT song, even with akon, who i don't usually care for), but then his verse comes on.
like i said, i haven't heard ALL of his stuff, but i've heard a lot, and to me that's enough.