It was released a little early on YouTube, but officially starts on June 7th. This makes, what? the second animated drama Disney's ever put together? (Gargoyles was awesome though) Seems like some decent writing.
I got the chance to watch the first episode on YouTube the other day. It may not have been exactly all that it was hyped up to be (I've been following its development since Legacy's release), but they clearly put a lot of effort into it and I would say that is pretty satisfying for any Tron fan. Also, there were times where the animation was just plain stunning. I will definitely be keeping tabs on the series over summer.
I would say that this and Disney's other new show, Motorcity, are the best-looking cartoons out there right now - bar none.
Personally, I enjoyed it - even though the frame rate for the characters was a little choppy at first, but that's probably an aesthetic choice. As for the show overall - it didn't entirely live up to my hype, but most action cartoons take a while to build up anyway. The first episodes for these kinds of shows are always hit-and-miss. So I'll still give it a chance.