I thought it was great and loved how they were able to fit all the characters in without it feeling forced.
If I had to mention one thing (and not so much a complaint) it would be this: For years I've heard people describe Deadwood as a foul mouthed show where the characters spoke like Shakespeare. And I thought that was a good description, but not 100% accurate. I thought the dialogue was great, but it didn't sound like Hamlet. But in the movie, there were at least 2 scenes where it seemed like they were trying really hard to make it sound like Shakespeare. The opening scene with Al and the Doctor seemed a little over the top. And then the scene where Johnny got shot outside the bar, he looked up at Al and said something like, "Alas, shot have I been!" It was odd.
But overall, a solid 10 out of 10.