First off, I do not feel this film vilifies Billy Mitchell, holder of the Donkey Kong high score record for over 20 years. Instead, it brilliantly depicts he and record-chaser Steve Wiebe as two men each battling insecurity. As the film starts, Mitchell is completely in control of his insecurity (his then-well-hidden fear that his last record will fall) while Wiebe is completely flummoxed by his (despite being so well-accomplished, he was never "the best" at anything).
As the film plays out, Mitchell's insecurity gradually increases as he sees that Wiebe is a genuine threat. Meanwhile, Wiebe starts meek (he has to be talked into pursuing the issue by friends and Mitchell's enemies). But the more Wiebe pursues it, the more he begins to see himself for the true competitor he is. I won't spoil the film in terms of who gets the record but the big story is: Wiebe gains more piece of mind from showing up for live competition than he does from having his record in a book.
I also recommend watching for more subtle moments that might elude the casual viewer. These moments reveal how even if/as/when Mitchell holds the record, he loses small amounts of respect from his allies, who comprise the inner circle of the gaming world. Even as they pledge their allegiance to him, there are little quotes and gestures of admiration to Steve that demonstrate their recognition that their friend is becoming more cowardly. One of my fave moments is a quick and subtle moment when Mitchell leaves Wiebe sitting playing games and Mitchell's (seemingly) trophy wife glances at Steve for an ever-so-brief second. It seems that even she realizes that it is Steve and not her husband that is proving himself the competitor regardless of who holds the record.
The film does contain those other gestures that make the audience want to root for Steve (his rapport with his family and friends, his 'aw shucks' demeanour and what position is more honourable than that of a teacher?). However, Billy is shown to have positive traits as well-- he is a top notch businessman and motivator. His words of encouragement to an 80+ year old woman pursuing the Q-Bert record show his more positive energy. It's just his misfortune that this film mostly captures an emotionally fragile state in his life. The film (and this is a credit to director Seth Gordon) actually plays with you in this way: while part of you wants Steve to break the record to shut Billy up, another part of you wants Billy to show up for the mano-a-mano so that he can overcome his own insecurity and just have a good honest competition.
The most entertaining competitions, whether it be the Olympics, football, chess, etc. usually tell human stories to make them transcend their otherwise meaningless or unimportant qualities. For 80 minutes, Seth Gordon helps the video game world do just that.