Uncharted 3 is easily the weakest game in the trilogy. The pirate sequence sucks, the update to melee leads to you fucking up rolling away from enemies, reinforcements are annoying, the supernatural sequence is immensely disappointing, the flashback sequence wasn't that great, and the villains supposedly being part of Drake's life for a while is unnecessary.
There are some positive parts of UC3 though - more guns, cool setpieces, a nice final boss, and the updated melee system does work very well in the forced melee sequences.