yes, as sy mentioned, i've played it quite a bit. i played both the original version on the atari st and the sequel, "space hulk: vengeance of the blood angels", on the pc.
i know this is possibly more geek than some of you can handle, but the board game really is worth a go. it's very fast paced, with someone entirely new to such things being able to pick it up in less than ten minutes. it's pure tactics, and there are clearly good ways and bad ways to play out each mission. it's genuinely nail biting when you've got blips coming towards you from all sides, and you're desperately trying to advance your squad while covering all the angles, hoping that your guns don't jam up!
i'm guessing getting your hands on the board game and another willing player is going to be pretty difficult, but the "space hulk sp" game that idol linked is as close to an exact representation as you're ever going to get. i've played through every mission on it countless times, and can highly recommend it. the way the action points work might seem a little quirky to the uninitiated, but you can message me on here or msn if you need help getting to grips with it. it's definitely worth it.
now i'm going to look into this nethulk thing. hmmm....