Paranoia - it is a our single-player modification for Half-life. You will play the role of a russian officer of the secret service. Your first impressions are that this mission will be just like any other, but you really have no idea what nightmares future events have in store for you...
It feels like STALKER, but plays closer to Metro 2033. I finally get to know what it feels like to be an American playing a Russian fighting Americans, heh. The levels look great and the design is well thought out. I found the human enemies far more difficult than the monsters, which made the monsters feel less threatening. The sound effects are great, but they often get overwhelmed by the heavy metal soundtrack, which I didn't care for. I would have preferred a more subdued combat soundtrack. I like the selection of guns and some of the new game mechanics like the ballistics mask and gasmask are welcomed. It unfortunately felt too short and I ran into many CTD bugs. Regardless, this should be on your list of "must-play HL mods".
I think this game is so cool, definitely deserves a 10/10 because it is the first mod that I have gotten and I believe that there is no other mod that could be better than this no matter what the ratings say. Awesome game, everyone must try it!