Gangs of New York (2002)

When a dramatic period piece opens with a massive battle sequence that is so poorly choreographed that the viewer wonders if the film is going to be a farce or comedy, you're in for a bad time. Though the rest of the film had its moments, it was self-indulgent and wallowed in points that were (I assume) historically accurate, but not interesting in terms of the story. The main villain also suffered from a terminal case of 'kill everybody mercilessly, except for the main character (for no conceivable reason)' syndrome, which reduced his character from awesome badass to... some threatening dude.