I don't have an opinion on KSY because I've never seen it. It just sounds to me like it was cobbled out of this unrealized project that was very obviously intended for preschoolers. So that's the problem right there.
Oz could have been better if they didn't rush production, first of all. They could have had better stunt casting at least. A stronger actress would have made the whole film mesh. And they could have gone quite a bit lighter with the pop culture references... and there was NO excuse not to have Bobo reprise his role as Jeffery Tambor's assistant. But overall, no matter how good the film could have been, the Muppets didn't play themselves, Oz is a tale told too many times (mostly parroting the 1939 movie), and it really shouldn't have launched the Disney Muppet franchise since Disney didn't really make it.
A lot of changes could have made the film better, but somehow I doubt it would have been very good no matter what. Say what you will about MCC and MTI, but they had Jerry Juhl's smart scriptwriting behind them. Though, I wish that Jerry was a LOT more playful with MCC, like he was with MTI. I mean, MTI gave us Old Tom, Really Old Tom and Dead Tom, the rat tourists, and a Lobster instead of a parrot.The Muppets' Wizard of Oz - It's been awhile since I've seen this one (I don't even think I got through all of it in my last viewing). This is yet another film that I feel could have been much better. Still, I liked the bright, colorful depiction of Oz (even if it's largely green/blue screen), and the various Muppet cameos were fun. 2/5.
Oz could have been better if they didn't rush production, first of all. They could have had better stunt casting at least. A stronger actress would have made the whole film mesh. And they could have gone quite a bit lighter with the pop culture references... and there was NO excuse not to have Bobo reprise his role as Jeffery Tambor's assistant. But overall, no matter how good the film could have been, the Muppets didn't play themselves, Oz is a tale told too many times (mostly parroting the 1939 movie), and it really shouldn't have launched the Disney Muppet franchise since Disney didn't really make it.