Not really. Don't appreciate having to memorize huge long codes to get content from a game. (ex:The force unleashed and TFU2)
That said, I used them on Robotech for the PS2.
I liked how Red Faction Guerilla used them. Once you got a certain statistic (say, shooting down 50 planes) you got a cheat code (ex: infinite ammo). That way, you still got the fun cheats, but you had to earn them, not just look them up online.