@the_drizzle: It depends on what you're looking for. for single player it starts out pretty slow but as it goes on it gets super complex to the point where it get be a bit frustrating. If you're looking for a good mechanical challenge (which happens in the way later missions) i'd recommend it.
Overview of pros and cons (from what I've read): + Amazing coop experience + Completely original sense of style + Unlike anything else out there - Visually a bit too busy (difficult to navigate environment during chaos) - Singleplayer is a lesser (although, certainly not 'poor') experience
I'd be interested in trying co-op with some fellow Giant Bomb users on Steam. Played single-player for about an hour earlier today; pretty cool but it seems like it'd be a better multiplayer experience.
@project343: I finished "The Locksmith's Story" today on single player. I liked the game as it became more complex and i became more focused on "cleaning out" the level rather then just finish the objective. I feel the visual noise is a valid complaint for the most part, but also less of a problem in singleplayer.