David Brevik basically said he would have done things differently (without elaborating how) and talked about a D3 flaw (loot system) that everyone and their dogs already know about. He then proceeded to shit all over the current D3 team while calling himself and the team that left "special", "talented" and "unique".
Jay Wilson has just released a game that broke all sorts of sales record but eventually resulted in a giant backlash against them. He is working on a major patch to be released next week that will hopefully fix some of the biggest issues with the game while thinking about the patches beyond that as well as the planned expansions. I'm sure his priority upon seeing the interview was to type up a 1000-word "professional" response to a guy who has nothing but vitriol for him and his team.
Not vitriol. The truth. The truth appears to be something Blizzard South would rather ignore. It's better to view the closed-down North as a "loser" studio, because then they could say the quality of D3 justified the 10 million copies of the game that sold on the backs of North's contributions to the series.