With Matthew Vaughn’s “Kick-Ass” due in theaters this Friday, Sony picked the perfect time to release their own movie about a wannabe superhero – only “Defendor” is a little different in that its title character isn’t exactly right in the head. Granted, anyone that decides to get into the vigilante business has to be a little crazy, but Arthur Poppington (Woody Harrelson) is also a little slow. Dressed in a black suit with a duct-tape “D” on the chest and boasting an arsenal of weapons ranging from a WWII trench club to marbles and wasps, Defendor roams the city helping those in need. After saving a crack-addicted call girl (Kat Dennings) from a crooked cop (Elias Koteas) one night, Defendor teams up with her to take down a New York City crime boss that he believes to be a fictional villain named Captain Industry. Highlighted by a solid performance by Woody Harrelson, “Defendor” has its moments, but it ultimately falls prey to some shoddy direction from Peter Stebbins, who doesn’t seem to know whether the movie is supposed to be a dark comedy or a gritty crime drama. Koteas has some funny moments as the sleazebag cop who’s constantly harassed by Defendor, but it’s hard to find the humor in a mentally challenged adult who risks his life because he doesn’t think that bullets can harm him. “Defendor” definitely had the potential to be a great addition to the superhero genre, but it’s never better than mediocre.