Since I like Keith Richards and Johnny Depp, I was let down that they didn't seem glad to see Kermit. Johnny tried at least, and did a nice enough job (though you hear him get annoyed at one point) but (if the small amount of footage they used is any indication) Keith really wasn't a fan, and just said, "Oh no" when he saw Kermit. I've been a Muppet fan longer than a Stones fan, and I was into Muppet music first, so it just seems wrong for Keith to be like that, ha.
On the other hand, I've never really been a huge fan of Aerosmith, but Steven Tyler was really cool with Kermit!
I have to give him credit for either being a Muppet fan, or just been an all around nice guy! Or both!