Dead Space is one of the best horror/action games ever made, with a good mix of both genres. However, that doesn't make it perfect.

There are some problems that are not so critical due to the fact that it is a new franchise, but they remain problems. Some of them, for example, is the fact that horror is basically composed of cheap jump scares.
Another is about the use of weapons. I managed to beat it in my first playthrough on hard mode using only two weapons: Line Gun and Plasma Cutter. With that first one, being extremely unfair as soon as you buy it. There are also several ridiculous and to some extent unnecessary weapons, which I don't see any point in having in the game.

Speaking like that, it seems that I didn't like the game that much, but it's not true. I fucking loved the game, and the highlight is the extreme immersion, with almost no HUD getting in your way, with all the information you need being in the character. Lots of companies needing to learn from Dead Space in that regard. (Cough Cough... Ubisoft)

The soundtrack, in turn, looks like an orchestra of the highest level. It's unbelievable what they managed to do with the track at times, especially at the beginning and end of the game, managing to enhance even more important moments in the story, making you feel angry, afraid, sad, etc...

About the story, it is extremely good, despite some moments made just to extend the duration of the game. But it is consistent and leaves many mysteries open for players to discuss at the end of the game.