Matt Riddlehoover is adorable, but this film is a mess, and the poor sound quality coupled with the chronic mumbling, non-linear storytelling and indistinct characters makes this very difficult to follow, not helped by the way nothing really happens. I had to constantly rewind just to figure out what people were saying.
The dialog is naturalistic, but unless you're not an upper-middle class white person and don't really associate with any, you'll have a hard time paying attention to what seems like everyday life to you.
Non-linear is fine, but you can't have several different recent periods you keep flashing to and still allow the audience to invest in the story. Also, I'm not sure how 20-somethings can have that boring a party. I've been to 70-something parties at my parents' that are hundreds of times more fun and exciting than this. The dialog is realistic, but also vacuous - not one person says anything interesting or insightful in the entire film.