Kingdom Hearts - I thought a combination of Final Fantasy and Disney would be an absolute disaster. Turned out to be one of my favorite game series.
Epic Mickey - Similar to Kingdom Hearts, this was another Disney-themed game that I was very skeptical of. It's actually pretty cool. A lot of Disney and Mickey Mouse history stuffed into a really fun action-adventure/platformer.
Shadow of the Colossus - A game that's made up entirely of boss battles? How much fun could that possibly be? A lot.
All three of these.
Plus.....
Limbo.
Star Ocean: Till the end of Time. I actually never finished this game, I first played it when I was about eight and it blew me away then, from what I remember of it, it was pretty fantastic. It also has merit in that its a space sci-fi JRPG that isn't absolute crap.
In terms of wow moments? KH is just packed with those, too many to count, really.