There are not exactly words to describe how graphic this scene is, but perhaps the most visceral part of it is the fact that you're doing the torturing. However, there's one scene in particular that had me unable to look at the screen, and apparently offended a few anti-torture advocates in the process.
But he's an entertaining character, so you put up with mini-games where you have to slaughter rednecks because he has a unique take on the world. Whatever it is, it's never really been a game for someone who falls on the the 'lawful' side of the spectrum. Like all the other Grand Theft Auto offerings, it follows around a criminal (in this case 3) as they shamefully run over people, assasinate random citizens, and generally cause mayhem.
