I don't believe it's Steve either, but I don't think the voice was bad at all. However, I do agree the puppetry was stiff.
Eric has come a long long way as a performer. Piggy was great, and I loved the classic Muppet shots on the screen. Nice to see Muppet chickens mixing it up too.
If I have a complaint, it was the bumper with Sharon and Piggy. The Pig/Frog tension jokes have been wearing thin for a while now. I'm not saying they have to nix the tension, but at least try approaching it a little differently. Kermit's CD for Piggy was sweet though. Nice to see some tenderness.