I do remember Dumbledore telling Harry in one of the books that Voldy was an accomplished Legillmens. While I don't have my books nearby at the moment, I'm pretty sure it was said at in the 6th book, when Dumbledore and Harry are talking about the memory Dumbledore recovered from Voldy's uncle.

However, I don't remember anywhere in the books where Voldy is called an accomplished Occlumens, just that he was employing it against Harry. I think the fact that Harry was able to see into his mind so many times kind of proves he wasn't one of the better ones around.