The film’s promise might amount to something even greater if there were more of this sort of thing, more pushing past surface characterization. The slender story line features Medford-bred writer-director Tom O’Brien as Jon, a faded jock and aspiring writer still somehow kicking around town in a deckhand gig, trying to sort out his self-actualization issues through everything from therapy to group meditation. (No wonder he’s got the Brady hangup — with his hunky gaze and chiseled, stubbled jaw, he even looks vaguely like Brady.) On the settled-life scale, Jon falls somewhere between his friend Sam (Rich Sommer, “Mad Men”), a schlubby, divorced dad, and their old buddy Dave (Chris Messina, “Argo”), back in town for his estranged father’s funeral and partying harder than ever. Jon, it’s clear, isn’t the only one struggling to figure things out.