We saw this on a whim, because we like the actors in the cast. Turned out to be quite a nice movie. While I generally think hitmen as movie subjects is getting kind of tired, this movie had much more going for it than simple action. The director did a fine job of interspersing pensive urban scenery shots coupled with moody music with great comic relief from Colin Farrell, a very sympathetic character played by Brendan Gleeson and an over-the-top in a good way angry boss played by Ralph Fiennes.
Also, there was a theme of sin and redemption going on that, coupled with the medievil setting was quite spot-on (though ultimately I find it hard to have sympathy for hitmen, no matter how conflicted or charismatic).