Kanye's early stuff was kinda juvenile and he's an okay rapper at best. I liked it but it didn't really seem like he was emotionally invested in it.
His newest album was alright too, "Moster" is an amazing song and really intense.
His best album is 808s and Heartbreak though. Its so tight, its so filled with emotion and beauty. Its got blippy bloopy synths and artificial sounding vocal effects but the emotion in his voice is 100% human and real.
The only track that isn't awesome is "Welcome to Heartbreak" and its still not bad. It just drags on too long.