I bought Doom 3 on saturday on my 18th birthday, it's so amazing! I played it until sunup with headphones and the lights off and it freaked me out more than any film or game I've ever played before.
I don't know what you're all talking about, what you should do is get a good pair of headphones, turn the volume up to near max, switch the lights of and play on the hardest difficulty from midnight for a few hours.