I'd also say most of my favorite games are playable on Nintendo systems (probably even my top 10)...while I enjoy games on other systems, they rarely tickle my fancy to the extent games on Nintendo consoles do. Although, there are games like Resident Evil 4 and Okami which are playable on other consoles...
Anyways, backwards compatibility is a pretty huge deal for me...It was the reason I jumped on the 3DS so soon and it was one of the big selling points of my Wii also. If the Vita had (physical) backwards compatibility I would likely jump on that too...







