I remember completing this game right after leaving Far Cry 2 mid-way. Both of them had released around the same time, but back then, I was more excited to play FC2. Surprisingly, while FC2 pee'd on all my excitement, this game actually pulled me into it. The whole atmosphere of a deserted space ship with creepy things in every nook and corner was enough to give us heebee-jeebies!
I never had any issues with aiming in the game. I used the 360 controller and had V-Sync enabled (hate tearing). The game ran exquisitely well even though I had an E6300 processor back then. From what I bleakly remember, I had maxed out my suit upgrade, Line Gun & Plasma Cutter. I didn't use Flame thrower that much, except on those Swarms which spawned out of Pregnant necromorph. You'll have to watch the Animated movie, it's a serves as a worthy prequel to the game. You'll also come across certain characters in the movie, the audio logs of which, you'll find in the game.