Thor's story arc isn't a farce, not by a longshot. He's probably got the most tragic Shakesperean arc of all the Avengers. He's lost his mother, father, brother, home and his sense of purpose. Not to mention he feels personally responsible for half the universe dying. You need the superficially farcical moments so it's not oppressively dark, but it's clear that in spite of the jokes Thor is utterly lost until his conversation with his mother.