Keep in mind King of Kong's accuracy is quite widely disputed, including by the people who were the subjects of the film. The filmmaker pumped up the drama between everyone quite a bit. Still a fun documentary.
IF you want to see a documentary without the pumped up drama, check out "chasing ghosts". Not as good as King of Kong, but still interesting.
I turned off King of Kong about 30 minutes. Everybody involved were such douchebags that I didn't care how it turned out.