I too found the Yahoo Screen service basically unwatchable on my HTPC with FireFox. Pretty poor quality even with plenty of bandwidth available on my end -- and it was also very choppy. Sooooo - I had to find an "alternate source" and it was smooth "sailing" after that. I'll probably load them up on a spare puter and let them play in another room just so they get the hits for their audience metrics... maybe a few times as I'd hate for them to drop the show because folks can't watch it due to crappy player quality.
I enjoyed all three episodes so far and find the end vignettes to be a quirky yet funny alternative to Troy and Abed in the Morning endings of the good old days.