Just watched the video and actually think it's really good. I mean, the voice isn't great but it's not bad. Also, he has similar speaking patterns to Matt's other characters, so that's interesting, but overall, everything else was really good. It kind of sounds like both Steve and Jim's Kermits. The main problem is just that his voice needs to be just slightly higher (especially if he wants to sing well), but let's be honest, this video was probably filmed months ago, Matt's probably already improved since then (don't forget, they have been rehearsing for The Hollywood Bowl for a while now).
Really, i'm just happy we have Kermit back after all these months.