beatifk, I was the same, I bought the first 4 Kanye albums right when they dropped. 808's and heartbreak is when Kanye lost me, but in hindsight, it was a masterpiece too.
as for the doc, I loved it, pretty epic. Episode 3 was sad though. Fame will do fucked up shit to people. It's kinda like when Bowie totally his mind to coke and drugs in the 70's....
Fave scene in the doc: when Kanye raps for Mos Def, he puts so much heart in it. Mos Def is easily the better MC, but even him does not have that much passion. of course the Pharrell scene was awesome too!