To think the installer (not the drivers themselves) isn't at fault here is quite naive. Firstly, bugs are erratic and unpredictable. You game, you read forums, you must know that very well. Different people experience different kinds of problems with the same game. The same is subject to happen with any other kind of programs, including a driver installer. Secondly, by the bits and pieces that were left in my computer, it was quite noticeable that the installer made half it's job. It was unable to stop the currently running drivers, but tried to install the new ones anyway, leaving me with a combination of old and new files. That's just such a basic error that it still baffles me to this day.
Anyway, I do agree that driver installs are notoriously prone to errors, that's why after experiencing an error first hand, I now only follow the safe route of completely uninstall, reboot and reinstall; and recommend others to follow it too.