I was there for that. It was awesome.
Really liked the weird dancing girl video he was beat juggling with.
I've heard Mills be sloppy and dull, and I've heard him being electricfying.
Also worth bearing in mind that outside of the "dj community" suprisingly few people care about slightly sloppy mixing. Its something you develop an ear for, used to find it really weird how it didn't bug other people when it happened. To me it was the sound of things going terribly wrong, but then there's a bit in my brain trained to avoid that sound like the plague.
He's not as famous as he is on the strength of his records. He fills clubs full of punters who have never bought his tunes or could even name you them. The reason he headlines festivals with 20k crowds is because he has something in his style that is unique.