You can see what James Gunn wanted to do with his vigilante "comedy". In a movie world dominated by Hollywood superheroes, he's turned his satirical eyebeams on what might happen if some schmo (Rainn Wilson) donned a lurid outfit and took justice into his own hands.
So far, so Kick-Ass. But Gunn channels uncomfortably vicious Taxi Driver demons. Wilson tries his darndest with the uneven material, but Ellen Page's sidekick is more dimwit than Juno, and Kevin Bacon's villain belongs in a more ironic movie.