PARANOIA is my favorite mod by far. The developers are masters of the art of suspense. My favorite part of the game is definitely after the explosion, you're stumbling your way through a mangled underground laboratory, your only contact to what is unfolding around you being the soldier that is heading in the same direction as you, albeit a few rooms up, describing what he sees before the shit hits the fan.
I found myself sprinting down the corridors, frantically scanning the subtitles, seeing the murals and corridors he had described, trying to get to the hostiles.
No other game made my heart race like this one. The lighting effects and textures were amazing, the high-res models blew my mind. I would definitely pay for this game.
My only complaint was that the gasmask was only used once. I feel that it ended somewhat abruptly, but that doesn't detract from the game much, as the storyline was fantastic. The characters were quite realistic. 10/10
p.s. and if there was a paranoia 2, my life would be complete.