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.
I guess with me, I don't mind violence, blood, etc..., but the biggest issue I had was that the comedy seemed forced. It didn't flow naturally. More than anything, I can't stand movies that have to resort to nothing but foul language and gratuitous vulgarity to get a laugh.
I'm not a prude, but a little goes a long way.
The F-word scene in "Planes, Trains, and Automobiles" is absolutely hilarious, because it has context and you can fully appreciate the situation.
Dropping 'em all over the place in a movie just because just doesn't work.