Have you tried the demo? Just get onto the Playstation Network, it's there. Free. I don't think I even finished the demo completely, but it gave me a good idea of what to expect. I'll go back and play it again when I have more time on my hands.
Alternatively, you can get the God Of War Collection (1 & 2) for PS3, and it's like ... well, cheaper. I don't know how much cheaper, it's just cheaper. Both are kick ass games and apparently revamped for hi-def.