I think all gamers of my generation agree that Medievil is a classic.
Despite its clumsiness and bizarre 3d models this beautiful game was able to give you the creeps, I remember perfectly well that as a child I got stuck at the level of the sleeping village because I was too scared to go on.
I also played the PSP version, very nice, although I didn't appreciate trying to make the game less creepy with the sidekick.
In Medievil 2, however, I got stuck in the boxing match and never finished it.