finished it and loved it.... line gun and pulse gun on the first run though ( gotta love the line-mines!)\
For the wife, this was a "play it on the 50" plasma so I can watch too!" game, darkened room, cranked surround....its a pants-pooping cocktail !
We loved them both, about to give number two a second run through.
In the end, its a great game and a great series in every respect.
My only complaint is that I feel that Doom 3 did a VERY SIMILAR job many many years ago. Yes, they are different games in several ways, but I found the lighting, graphics, sound, and much of the play-style very similar, and I expected more after so many years.
However, they made up for slightly dated tech with an amazing storyline and a great ending!