NO SPOILERS
The game is very mediocre the characters are all stereotypes i.e Angsty main character, main characters bulky mate, standard anime love interest, old veteran etc. Also the jumping is over hyped because when you do jump the wii chugs like a hippo doing sit ups. And there are hardly any places where you can jump back up too only down, so it is a bit pointless. I suppose the combat system is good if u like trying to memorize strategies, and having to go through whole mini menu's to bring up one sodding attack. Also some enemies can only be seriously damaged by the Monado (red sword thing), and when these enemies are very frequent and only one character has the sword. This makes for an awkward combat system (in my opinion).
The story is long and has it's moments but in my opinion too long, it also became to boring to complete. but THE SETTING IS AMAZING two giant robots in the sea, I mean wow.
So yeah don't get too excited because you will end up disappointing yourselves. Sorry if you feel I was harsh I just thought you ought to know