I really enjoyed it on the Xbox 360 BUT I will clarify. The story sort of sucks and makes no sense. I didn't care because the battle system was very very fun and I felt rewarded for leveling. The art style is really nice too. Basically if you play RPGs because you like the game style you will like this but if you play them because they are books you click through avoid it.
I have a very large game collection and I disliked this one so much I sold it about a year ago for $25, which was $15 more than I payed for it. I am sure the price will stabilize in a few months when MGS4 hype has died down. Previous series entries always shoot up in price around a new ones launch.