Any games where you started playing without a lot of expectations but ended up becoming one of your favorites?

[Cloudman]

The Trauma Center series. I remember visiting a friend, who had some rented games with one of them being 2nd Opinion. I thought a game about surgery would be stupid, but I played it and found the game was actually pretty cool. I kept playing until eventually I felt I had to get this game for myself. Since then I've gotten all the following games and enjoyed them all

The same has happened with Kingdom Hearts and Wind Waker.