WoW is really the only the only video game you need, you could play it for 12+ hours a day for every day of your life and die of old age before you 100% it. I've never played Forza but it's clearly the best racing simulator because it has Ichigo Mashimaro cars. I've 100%'d most GTA games already but never got around to playing Saints Row, and with Mario and Pokemon on top of that the best choice is obvious.