My NES is still alive and working... So... 3 years is bad comparativly.
However, the more advanced something is, the less likly it is to be durable. My 360 lasted 2 and a half years before it asked me to marry it... I was flattered, of course, but I was already engaged to my computer. That and the fact that once it handed me the red ring (Which was broken already! How cheap), it refused to work anymore. Well, I'm not marrying something that would not work once married, who am I, my father(ZING!)? Nah, I sent it packing, and had a new one inside a week(Ok, two weeks). If you don't mind voiding a warrenty (If you are just under the 3 year warrenty), then you can actually fix the issue yourself, though I shall not link, since Google is more helpful anyways. Plus, some of those sites proliferate illegal activities(NOTE: Link does not endores those things, you dirty, dirty sea lover, you!).
And in response to the Get a PS3 comment... Really? How is a system with games released later, which costs more, with technically less backwards compatability and less quality games per capita more fun? Sure, she's a powerful beast, and maybe she'll make a man happy one day, but how does that help a 360 gamer who has the game saves, and games for another system? How about something more on topic, and less fanboy flaming?