Quentin is an incredible character in the show. Infuriating at times, immature, whiny, selfish, but in ways that are relatable. Everyone is immature, whiny, and selfish to some degree. Quentin’s story in the show is about getting out of his own fucking head and finding health and happiness in feeling connected to other people. His story as the MC is explicitly about him appreciating that he is not in fact the main character, and that’s a good thing.
Corollary of that is that the show ends up being a truly ensemble cast story, which is really refreshing. Plus Eliot and Margo are perfection.