I was lucky enough to see the movie twice this weekend (more on that later) and I can honestly say that the ending is very, very good. I really enjoy it. The final song is perfect--perfect. It's the most exciting finale a Muppet movie has ever had. It's not as epic as "The Magic Store" or Muppets falling from planes, but it's just so happy and fun. The actual plot ending? It left me satisfied and craving more, as any good ending should do. It gets a little more plot covered in the credits, before "Mahna Mahna," as well. It's a brilliant pay off that I'd been waiting for the entire third act.