I have to agree that I think U2 still has the edge over U3 in my opinion. The second game was such an improvement on the first that it would always be difficult to recreate that. That being said, 3 is still an incredible game. The 'Rough Seas' chapter is by far my favourite in any Uncharted game.

To be honest, this probably shouldn't have been posted as a thread when you've only completed half the game. I'm on my third play through now (treasure hunting!) and still wouldn't say I've seen everything the main game can offer.