The PC version of Grand Theft Auto IV should have been the best version of the game. The keyboard and mouse combo is simply a better control scheme for this game and the PC version can offer a better-looking game than its console counterparts. Instead, it is still plagued by a myriad of technical issues and a lack of an active multi-player community.
It is impressive that the game is still a lot of fun even with everything that pulls it down. Just the quality of the gameplay brute forces its way through all the muck and provides a compelling and entertaining time. If you have the system that can handle the game, by all means, get this game on the PC. For everyone else, the console versions are a safe and sure thing.