The really good thing about having back to back episodes is not having to wait a week for a story arc to play itself out. Mandy Moore gets the patented Scrubs Celebrity Fan Blower Treatment and between this and her guest arc on Entourage has proven herself to be a good sport about stuff like this.
Although they seem to be making J.D. goofier than normal this season even by Goofy J.D. Standards.
Yes, Will Arnett and the guy that played Ben Franklin on that one episode of The Office were hilarious, and there's a set piece with Tim Meadows that has nothing to do with anything before or after it that was pretty great. Otherwise, not so much.