For the most part, I play games for the fun of it and the storylines / scripting. There should be some challenge (which is why I go for normal rather than easy difficulties where possible), yes, but when it gets to a point that I'm getting killed over and over and over then I am more than happy to turn it down or check a guide/walkthrough. I hardly ever play at a higher difficulty level than normal, really. There are some exceptions, though. I finished Uncharted 2 on every difficulty (easy only for the sake of treasure hunting etc), for example. But yeah, those are rarities.