The thing is, Tank (Cook) acts this way because it works, not because he wants to. What he really wants is to save other people's relationships, but he can't have those himself. He'll just have to play the game, not because he made the rules, but because everyone else follows them. He has values, but if he's gonna be successful, he has to really bold. It's the opposite of Good Luck Chuck, who just wanted to be nice but was cursed with the power. Trust me, someone in the movie explains Tank's moral center too, so I know I'm right.
The film doesn't glorify his p*ssy friend (Jason Biggs) either. It's not like he's the poor nice guy who just can't get a break. He's a real weirdo. I mean, as sweet and well meaning as he was, that guy had nothing to offer. Who wants some preening loser whose whole being is adoring you? What does that bring to a partnership?
The best part is that Tank is running his game on the ultimate rom-com queen. It's the reverse of How to Lose a Guy in 10 Days because she's in an emotional place to just never let him go no matter what. He's actually really frustrated.
So you see it is either derivative of or having fun with all the romantic comedy standards. Either way is fine. All the popular ones have fairly evil manipulations between lovers anyway. It's like he used all of Nora Ephron's powers for good instead of evil.
There's a pretty amazing male perspective on women here too. The vulgar slut is rooming with the chaste queen, because those are really the only two types of women these guys would deal with anyway. Finally, a romantic comedy for both guys and girls.
There is enough A-hole pickup game fun peppered throughout the love triangle plot, so it doesn't totally lose its hook to service the three act structure. There are some harmless antics, like the obligatory dance scene, lest it be too edge for some dates. It's got the best wedding scene ever.
I just loved this movie. My Best Friend's Girl is the best romance since The Notebook. Dane Cook is the men's guru for romantic comedy. I know he has all the answers.