Well Pete, years ago I read a review of one of the Star Wars sequels. In it, the reviewer stated that CP3O had grown tiring. That's how I feel about Sheldon. His character has grown tiring. Something of the same can be said of Raj. The rest of the characters are (relatively) robust although not as robust as in prior seasons.

I'd enjoy reading a psychiatrist's analysis of Sheldon. He should do one of Barney Fife while he's at it. I think that Sheldon and Barney share some of the same insecurity, self-esteem issues.