Excellent
I'd compare this to Tomb Raider but with less depth to it. The platforming aspect is brilliant which makes you feel you are swiftly pulling off some great moves. Many people say the gun fights are repetetive but I find them very fun. Some of the animations you see Drake doing during these add a great touch. Difficulty has been a bit of an issue with this game however. It can seem a bit harder than what you've set it on (medium seems like hard). This may depend on the person playing the game though. There is a built in reward system which has now been linked to the PS3 trophies which is very good. The rewards you receive are worth while and some encourage more reasons for replays of the game.
For Playstation 3 owners, I'd say that this is a must have game.