Olynyk's got his own thread... let's keep the talk about him in there.
As far as these draft websites go though, they're all reactionary. ESPN has the inside info, so they wind up being the most accurate in terms of draft positions, but they don't always have the best scouting reports. For them, it's more all about moving players up and down their draft board based on the inside information they receive. DraftExpress is pretty thorough, but they've still got some opinionated guys running the site that're trying to make a name for themselves. NBADraft.Net should really just shut down... they're really becoming laughable.
I used to always use those websites as references, but now I just trust my own opinion over theirs.