Dead Space is neither the "best shooter ever made" nor is it "total crap". It falls squarely inbetween those two extreems. It would be a much better game if it wasn't for the frustratingly stupid way that you repair the ship. That thing on your suit that slows time down or something to help you fix parts of the ship is really hard to use. I just can't master the timing needed to fix some of the ship. It wouldn't be so bad if these repair puzzles didn't grind the momentum of the game to a screechin halt. Your running along, enjoying the heck out of killing mutated/infected/possessed crew members when you crash into a dead end caused by some door or ship module you must fix in order to do anything else.
Sure the same sort of thing happened sometimes in the superior Half-life games, but at least those puzzles weren't as close to being impossible to solve as the ones in Dead Space are. I didn't mind the interruption of the puzzles in HL quite as much as once I figured out what to do, I was physically able to pull off the button presses to work the solution. Even when I'm kinda sure I have the solution, I can't always move fast enough to work the solution in Dead Space.
Yet another game I've had to abandon because my reflexes and hand-eye-coordination aren't superhuman enough. sigh...