Most startling part of the episode for me was the realization that Chong's 72 years old. Good gravy!
There was a lot to love about the first segment. The cheesy intro to the "That's Kent-ertainment" segment, the Cheech & Chong origin story, the return of the really, really tall guy, and Homer wanting to meet Don Johnson.
Unfortunately, it just couldn't bring the funny for the rest of the episode. I couldn't get into the B-plot with the crazy cat lady or the main plot with Cheech and Chong making dueling comedy duos. And the Shakespeare ending was just plain random.
Homer: Chong is refusing to fall back on his old catchphrases! Bart: Aye caramba!
My wife and my reaction was the same, Eh! Tennent did a great job as Dr. Who and my favorite next to Baker, so its tough shoes to follow. I just think his face looks like some weird Kroft puppet mask and his punch looked totally weak.