Personally the best out of the 3...
-Better combat
-great use of weapons
-detailed and intriguing levels
-great story
-wonderful character depth
It lacked a perfect 10 in my book simply that is was shorter than the other 2, and it was sadly too easy on the "normal" difficulty setting. The first 2 games on normal felt just right, but for Uncharted 3 I felt I was just breezing right through gun fights. The only other draw back I can think of is it's puzzles where way too easy and too familiar. It could be just me being a gamer for 20+ years but I felt the puzzles were not a challenge one bit.
There is some repetitiveness with the "BIG THUG" combat, but it's not overly used.
Co-Op and Multiplayer is WONDERFUL!!! There's a variety of things to do. I only wish character creation was a little more detailed.
Overall, if you've followed the series since it's debut it's a MUST HAVE!!! If you've never played the series, PLEASE start with the first one. It'll be very hard to go backwards not only with the controls and layout of the game, but you will miss a truly, exciting and original storyline with HUGE character depths!!
Drake and Sully are a pair and I laughed often with how they interacted in this 3rd installment