In the beginning, Chase was the reason I wanted to watch Community. He's a comedic legend. I grew up with Clark Griswold. I love(d) him.
But Pierce's character has fallen flat for me, and Chevy's character off-screen could be (IMHO) to blame for Harmon's exit.
I'm happy to see him go (rumor is there is one more episode to shoot and he will not be in it), but how will they explain Pierce's exit? Recently, I came up with some ideas as to how to get Chevy Chase off of Community.