Big fan of the first two dead space games, but this isn't dead space and I didn't expect the same game.
Sure there are similarities but they didn't bother me. Visually the game is stunning and I liked the atmosphere, for me it had an Event Horizon, Alien feel to it.
Is it the scariest game ever? No. Does is it have the best story? No. But hey this is like a sci-fi B movie, you like it or you don't.
The combat worked fine for me. I did find the world a bit empty, as in the same few posters and a soda machine everywhere. This took away a little bit of the illusion.
Is it worth full price? Well that depends, for me it was but I love sci-fi horror. If you think sci-fi horror is meh then wait for a discount.