Yoda is such a life like creature that this just looks disturbing. Even though we know Yoda is a puppet, he feels so real. It's not even that he looks one hundred percent realistic. It's just the overall humanity that Frank Oz gives the character through his voice acting and puppet work. That's why I don't like the sight of a big hand up Yoda's butt controlling him. Even though we know it's real, I'm not ready for it.
I have several Yoda figures which all look incredibly different. My favorite Yoda figure, even if it isn't my favorite Yoda, is the Episode 1 original Yoda. That's the one who is infamous for saying "how feel you?" He looks like an old man, even though it's supposed to be decades before when we originally saw him. I don't know why, but I think that's cool.