well there's a few people here who own 360's, but i'd say if you want to get one based on the games you like then go for it, but here's the thing, most of the 'better' xbox 360 games can also be found on PC's. So if you have a uber gaming quality PC i'd say hold your cash.
Otherwise if your looking to invest in a gaming machine which guarantees you a lifespan of atleast 5~7 years then sure.