I'd almost deleted it from my netflix queue based on overall poor reviews, both critical and from users (whose main complaint was that the movie didn't follow the book closely). Glad I watched it. It was quirky and unexpected and quite entertaining. I gave it 4 stars, possibly because I went into it with such low expectations.
There's a trailer hidden on this site for anyone who's interested.
http://www.killingbono.co.uk/