I don't really have any desire for my characters to be overpowered in any game I play. Of course what's overpowered depends on setting, genre, etc., etc. Generally speaking, I don't feel overpowered if bullets are bouncing off my character's chest in a superhero game but it's going to be weird if the same thing happens to my character in a Call of Cthulhu game. I tend to get bored with encounters where my character is overpowered and my opponents pose no threat. What's even the point of playing things out?