I found the last two seasons to be major letdowns. It feels like now every episode has to be based whatever is a 'big story' in the world. I know that the older seasons had episodes like that too (Kenny parodying Terry Schiavone as a prime example), but they didn't seem to do it as much. Among the crop were lots of unique episodes that just stemmed from the minds of Matt and Trey. From some of the episodes I recall watching, they parodied the election, the somalian pirates, twilight (in a way), The Jo Bros, The economy, and Kanye's ego.

BUT that episode about the pinewood derby race car that broke 'the warp-speed barrier' was gold