GTA San Andreas on a PC.
OMG, sheer genius and then some. Sure I could be an idiot and mention a couple of bugs rather than appreciating the sheer gigantic scale of the map, the number of missions and vehicles. Kept me occupied for tens of hours and I can dip into it again and again. It looks fantastic as well.
It's shown me a side to the US that proves I must never live there
Now I know why some of the posters from the US are like they are