I never played Dead Space. It looked intriguing, but time and money constraints just didn't allow me to give it a shot. After I saw this Dead Space 2 gameplay demo.. Holy hell. I need to buy Dead Space and get into this series, because this sequel looks absolutely ridiculous!
Just watch it. Both parts. It's about 7 minutes of gameplay, and every second of it is worth your valuable time. Let's be honest, you're probably reading this at work or school, so I'm sure you have nothing better to do anyway. But I digress, watch it now!