This told a better story than the video game. Apart from some really bad eye-rolling moments (some *really* cheesy dialogue, WMDs), I really liked this movie. Jake was not bad, and Ben Kingsley always delivers. The use of political subtext was pretty clever and added a lot of flavor to the story (even with the WMD bit). And the parkour effects were done very well.
I mostly agree with your point, but your numbers are mostly wrong. The latest monthly sold approximately 31,596 copies (http://www.comicsbeat.com/2012/03/01/indie-month-to-month-sales-january-2012%C2%A0/)