Meh, as far as I understood, biggest cause of the nasal sounding voice was something with the techs, not LaBrie himself. In fact, if you heard the Download Festival 2009 concert, he sounds as bad there, but he sounded great on any other concert before and after it on BCSL tour. Could be the same case.
Either way, it is kinda bad. His voice had a drastic uplift during 2004-2006, I guess some of it had to be reworked after the few months between their last concert at 2006 and CiM tour, and I guess some of it had gotten better too. It was just a mixed bag of everything, especially the poorly recorded performances, so you can't judge him. The expectations mostly were he'll get better at the next tour, and they were correct.