Before my 360 arrived, I was a Nintendo fan. Plain and simple. I did envy all the other consoles with their massive amounts of games and online comunity, yes. When i got my Wii, I was happy with the few games it had.
Then I got some money.
With a fist full of money, I decided to buy a 360 and a few of the major games - I've now decided that the Wii60 partnership is destined to live on in greatness.
With a massive online community, the XBox 360 is truely this generations... something. There are plenty of good gamers out there who will happily play with you and be friends with you, so you never feel alone when you are playing.
The console itself is pretty cool. I sit mine upright next to my TV, and its easy enough to put games/peripherals inside.
The games are indescribable. New games come out for the console pretty much every month, and they are must haves. The graphics on the majority of them are excellent, and the gameplay is often betteer than the last game you played.
Overall, the XBox 360 is truely a proper gaming system.