I don't understand for what reason people are not finding the movie funny. The theatre i was in everyone was on their seats laughing. There is a scene where there was a literal thunder of laughter in the entire theatre. The people finding logic, c'mon dude its a comedy movie what do you expect interstellar?
If you wanna have fun, lighten up your mood and have cramps while laughing (if you understand humor) then it's a must go.