This could be fun. I'm gonna go by series because most of mine have ultimately interchangeable gameplay among titles in the series. Also, I'm not an obsessive game freak so my list will have really accessible stuff that will make you all roll your eyes at me.
In no order, parentheses enclose systems I've played the series on:
Guitar Hero series (PS2/360)
NBA Live series (PC/PS1/PS2/360)
Dynasty Warriors series (PS2)
Honorable mention to the NBA Street games and the Tony Hawk games.