This episode had a rare quality these days: fun. It was a little silly and it didn't have the most fantastic plot, but it was funny. It has a lot of visual gags (for once the montages were fantastic), and also these fun ideas that came out of nowhere, like Lisa's activist friends. The visuals added quite a bit, with some good character expression and nice colors. I also really liked the silly Casablanca reference towards the end. Mary was a nice enough character and I think the twist kinda made sense, but I hope this is the last time we see Bart almost getting married. Bart was pretty good but I think him showing a more jaded side here and there would have helped since the episode seemed a little childish and a little like a saturday morning cartoon because of the silly and kinda naive plot. Not the most memorable episode but one that certainly has some rewatchable quality to it. Homer was also ok for the most part ("Also, don't be a cow" "And, if necessary, the sweetest meat of all: human"), though I don't really know if I like these plans involving him getting into trouble. I mean, the family is saving a cow, but they are exposing the family father to a possible death? Sometimes I wish Homer acted more like another member of the family instead of being in these crazy escapades. The scenes were funny enough, though, the Laughter house gags was ok-ish. Loved the Pirates of Caribbean 3 gag. I did like the movie at the moment, but now that I remember it, it was really way too crazy and surreal compared to the previous ones and the epic moments were overdone and crappy.
If episodes with more ambitious plots were developed like this (with good jokes both visually and in the dialogue, and logical progression in the story) in a more regular basis then the quality of the show could improve quite a bit.
Oh, I thought the Transform-O-Clowns or whatever a little silly, not a fan of that part, it seemed extremely elaborated, I prefer when parodies are shorter and simpler. Here it seems as if the writers were thinking a little too much about creating a really absurd show and the result is not really that clever or hilarious.