He is not a very goog close up perfomer
I would have to highly disagree here based soley on his "Grandfather Aces" ace assembly.
His technique in that trick is flawless. Watch him do the two color changes on the 2nd and 3rd Ace. Even if you know exactly how he's doing it you can't spot it at all. Ive watched the video over and over and over and I have no idea how he makes it THAT clean.
If you watch guys like Oz or Jay on this site, who are wonderful magicians, you can sometimes catch them if you know how to perform the sleight or even just have a basic idea of how to perform it. But with Copperfield you can watch that video a million times and youll barely catch anything.
For that ONE trick alone I would say hes among the best out there if not the best. I think it would take an experienced magician a long long while to get that routine as clean as he does it in that video and anyone else months to years.