The point of the GTA series, especially GTA 5 at the moment, seems to need to be explained. It's realistic satire of the portrayal of criminals and the US American Dream via media and society. A lot of the criminals, as said by the US media, have no motivation to do what they do other than because they are selfishly evil. And GTA 5 catches that media portrayal perfectly, with your characters being downright atrocious. The US American Dream? We have three aspects of that, someone trying to get better, someone currently experiencing it, and someone that attempted and crashed trying to attain that Dream, and that's the same way the US media portrays that as well. You need to be cruel, cutthroat, and horrible to your fellow humans to achieve and maintain that great American Dream, and if you crash because of it, well fuck you you're now trash.
Even then, you have to see how the characters handle the world. So far, Franklin hates his life and wants to better it, the people he's around with are two timing gangsters that keep trying to drag him into their life, causing all sorts of problems when they cause inter-gang rivalries to flare, especially when he has to deal with his only relative (aunt that shows little to no care about him) that would rather see him disappear. Michael hates his life and family, but he's trying hard to at least get in touch with them, his son and daughter at least. He knows he's got issues, and at one point, he apologizes to his son for his behavior. Unable to say much about Trevor, not having gotten to his area yet.