Chains of Olympus is an amazing technical achievement for the PSP. This is a must buy for all PSP owners!
Gamespot's review complained about it being recycled but this is far from true. There has never been a handheld game like this, and it should not be compared to the PS2, but to the other handheld games, where it's in a league of its own. God of War is long enough for a PSP game being about 8 to 10 hours. But it's an amazing game you'll want to beat many times. It's got all the violence, smart dialogue, mythological beasts, and mini games… ;) that you've come to expect from a God of War games. This game really is the new benchmark for what is possible in a handheld game.
The only complaint I have is that there were a lot less puzzles in this God of War. But the amount of other things that they were able to fit on this PSP disc far out way any negatives. This isn't the best God of War game ever made, but to me it's the best handheld game i've ever played. If you own a PSP I strongly recommend that you go out and buy this game, you won't be disappointed.