worth playing, but if its not your thing, its not your thing..
Like skyzerr33 is saying, not much too it really.. and if you want a more complex shooter there are others around. Anyhow, its keeping me playing. I'll probably endevour to finish it, and I don't finish too many games.
Works on older systems and scales pretty well down to older systems, but you only get 640x480 and medium or low settings. Meant to be ok, but would take away a fair bit of the atmosphere in a game like that i reckon.
runs nicely on mine with high detail with 1024x768 w/ Athlon XP3200+, 512mb RAM, and 9800pro extreme overclocked to above 9800XT speed. Wouldn't want much slower than that to get the full effect.