This game is great, I bought it 5 years ago and I still play it. Doom is the first complex 1st person shooter, with twitching lights, lifts, and more. A really good way to give yourself a scare is to turn off all the lights, and play Doom at night when your alone. Its REALLY scary, especially when all of a sudden a demon comes out of no where and takes off a healthy chunk off your face. The game has 32 levels, 7 levels, and enough monsters to make you doomed to addiction.
After you have played the games through on nightmare skill for a few times, and it starts putting you to sleep, you can download a few programs that let you edit and create levels (Edmap, and WaDAuthor are my favorites). Another program called dehacked lets you edit hitpoints, damage, frames, and tons of other stuff-I made a super weapons patch that lets you shoot like 20 shotgun rounds in one second. You can also edit the graphics and sound with WinTex. All programs can be found at www.gamers.org.
One small drawback for experienced first person shooter players-the controls are not as good as quake's, and strafing is much harder.
There is a multiplayer-but I've never tried it, so I cant say much about that.
Thats about it-In a nutshell, Doom 2 is an excellent game that any first person shooter fan must have.
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