I did feel like the movie was trying to make me empathise with Z over the others which I didn't really like; at the end when the lawyer tells him that he's not an asshole, I found it artificial because I couldn't see what on earth had led her to that conclusion.
YMMV though, it seems to be quite polarising and you may well be right that it's based on existing perceptions; I didn't sympathise with the Ws in real life, but then I wasn't a huge fan of Z either.
[1] http://sportsillustrated.cnn.com/2010/writers/jon_wertheim/1...
I mean I could understand 'naive' and even understand dislike for kids who come from old money.
Yet money-grabbig/egotistical is a bit weird to parse. Heck if it was a kid from lesser beginnings and he fought back, he would have been the hero of the movie.
I don't think egos is weird to parse, they didn't just come from money (incidentally I come from money, to a lesser extent, so that doesn't set me automatically against people), they were the type of people that think their coming from money makes them superior in more ways that just their bank account balance.
As to money-grabbing, it's my opinion both from the actual story and also the movie, that they frankly didn't deserve the money they got from Facebook, so yeah they were money-grabbing in their legal pursuits.
In fact in a scene, the Zuckerberg character says 'The winklevoss are suing me only because, first time in their life things are not going as they desire'. That almost means they are used to getting easy money and making others work for their luxury and that didn't happen this time and they met someone far more intelligent, capable and hardworking who doesn't need 'Dad's money and influence' to win in the world. And he can do that on merely merit, while they can't.