Freddy Got Fingered, the movie I personally found funniest, is currently at 11% on Rotten Tomatoes. It's full of creative and quotable scenes, and never resorts to tired cliches (despite its genre there is no toilet humor). Penalizing a gross-out comedy for being "gross" is a clear failure of criticism. Even Roger Ebert, who usually judged movies by the standards of the genre, made this mistake.
Batman v Superman, the superhero movie I personally found most engaging, is at 29%. It's one of the few movies in the genre that feels like it has any ambition to be serious art. It takes the characters seriously, without the constant jokes the Marvel movies use to reassure the audience that they're not really comic book nerds. Critics considered this a reason to rate it poorly.
While I don't personally like the "gross-out" style of movie, the the discussion of the movie exposed a lot of nuance behind the movie that I didn't know. The difference between the conversation and the original "professional reviews" really was telling; I much prefer the former to the later.
*: I am aware of the contradiction; in my defense, I mostly care about their comments about movie structure.