2 and 3 feel about the same, in terms of pushing you from one set piece to the next, making scenarios that look fantastic (and dangerous) that are actually fairly hard to fail. Also punishing players for not doing thing in the way that ND wants.
They're both roller coaster rides.
3 just happens to be a better ride, with twists and turns that are even more unpredictable. If you've avoided spoilers, Uncharted 3 will surprise the hell out of you, chapter after chapter. There are... hm. I can't even give you any hints. I'll just say that Uncharted will go in directions players aren't expecting
But man... I don't see why ND can't (or refuses) to flesh out the platforming. It is literally mindless. One path, nearly impossible to fail. No timing like Tomb Raider, no grip meter... it's weird - the gunplay is actually fairly challenging. So why can't the platforming be dynamic too? Even modern Tomb Raiders have better traversal/climbing systems.
Edit: To be super clear, if you're like me and count U2 as one of the best games this generation and one of your favorite games every, U3 will deliver on your hype and more. But if you're an Uncharted detractor, if the "cinematic experience" doesn't sway you, then you'll not be won over this time, either.
Some gamers can lean back and go on the ride. Others can't.