U2>U1 but it's still more of the same.
U2 is a very good game, it's a 3rd person shooter/platformer , the game is doing very well in both categories but the platforming while it's very beautiful with incredible animations, it's occupying larger portion than it should be, the shooting is holding pretty good as well but some control issues will bother you from time to time, when taking a cover, when changing ur cover ...etc.
the game improves over U1 in almost everything, the gfx are WOOOOOOOOOOOWWW, you will see how good the game is graphically while you move on, everything is very detailed with small nice touches everywhere, the game isn't overhyped at all, it's the console gfx king.
the game story is good enough, but the overall plot is of course about searching for a treasure, but there are nice twists, the story will also make you travel thro alot of beautiful locations.
i really recommend this game, i guess you won't listen anyway if i dun recommend, the game is very good on its own, it's slightly overhyped imo, while the game gfx, story, music ...etc is top-notched , there are some certain issues in the gameplay that holds it back.
Note: i didn't comment on the multiplayer portion coz i didn't play it alot, but during the time i played it, it was too much fun.