^See the problem with SH reviews is there have been three lower scores, and three very high scores. One review hates parts, while the other review love those same parts. Its pretty strange because none of the reviews seem to agree on much of anything.
That said, Dead Space does offer a different storyline and some cool features, so maybe this is a better option. I personally decided to hold off on SH and DS. When DS comes out, I want to see the reviews, then pick one of the two games up. We'll see which one I end up with.