Marathon Anyone?

Hey I was woundering if anyone plays Marathon.
If your intrested like i was click this link u can dl all 3 games in the series.
http://source.bungie.org/get/

To get is here is what you do.
1. Make a folder entitled Marthon or w/e scenario your dling.
2. dl Aleph One and Copy and just Aleph One into the scenario Folder.
3. Once the File is inside the specific scenario folder just double the icon and play.

I think this is an excellent game although the graphics are old.
This game takes place 250 years after the events of Halo.

Yeah its kindof like the original Doom in a way, the bullets move so slow even hard is easy.