Improv on film - it doesn't quite work

The recent Don't Think Twice gets off to a fine start as we meet the 6 members of a Improv theater troupe, The Commune, whose name, bearing, and even the Dylan reference in the movie title invoke the spirit of the 1960s, and the movie will inevitably remind you of some classics of and about that era, particularly "reunion" pix such as Return of the Secaucus 7 and the Big Chill (as well as the Swedish movie about life in a commune), but the problem is this isn't really a commune, it's a troupe of actors who seem to spend an inordinate amount of time together - the movie is unclear and uncertain on this point: at one time I thought they all lived together in a loft space, but then it seems several of them have their own NYC/Brooklyn digs - apartments that are far too clean and lavish for anyone in a hand-to-mouth theater group. What started as a good, almost documentary film about Improv theater becomes a romance drama as one member of the troupe gets picked for the cast of a show modeled on SNL, spurring jealousy, suspicion, etc. among the other members. There's potential here, as each of the characters wrestles with his or her future - at what point in your life do you realize you're not going to fulfill your early dreams and move on? Never? - but I have to say the movie didn't exactly grow on me - in fact it grew off me, as the characters seemed less (not more) real over the course of the movie. I never quite got or bought into the interactions among the members of troupe - except when they're on stage: the film did give me a great sense of the difficult of managing an Improv performance. Otherwise, this film seemed to me like actors in their 40s playing characters in their 30s who act like kids in their 20s.