I have only shut off (from rentals or otherwise) three movies recently. Two of them were Seth Rogan movies. "This is the End" was one, shut it off when the guy was decapitated at the front door. The other was "Neighbors". Shut it off 15 minutes in. Just not funny. Painful to watch. Reminded me of the scene in "Idiocracy" when he went to the movie, and it was getting huge laughs while he was trying to figure out what was going on. The third was "The Darjeeling Limited". Just slow to develop and I wasn't in the mood for slow-to-develop movies that day.
Funny, my wife felt about Idiocracy the way you feel about This is the End and Neighbors. Me, I loved Idiocracy, it is perfect satire. We both tolerated the two movies you disliked, but had difficulties with the excessively and gratuitously vulgar parts. We were lamenting the need for those scenes in what would otherwise be funny movies. It seems the younger crowd, the 20s and early 30s, like those kinds of movies, and are desensitized to the disgusting parts.
Point being, to each his own. I'm sure there was some old fuddy duddy saying the same things about Monty Python, Richard Pryor and Porky's back in the day.