Having the option to change difficulty is always welcome, even if I don't end up using it. I usually start on normal and then change if I get bored/frustrated.
I did lower difficulty in Oblivion sometimes if I came across something that was curbstomping me repeatedly, because I didn't want to go spend several hours doing whatever before actually finishing that quest. Also dropped down to easy in boss battles in Deus Ex:HR because screw boss battles in that game.
What I don't like is when a game only lets me pick a higher difficulty after beating it once. There's no excuse for that, even with Diablo clones.
I did lower difficulty in Oblivion sometimes if I came across something that was curbstomping me repeatedly, because I didn't want to go spend several hours doing whatever before actually finishing that quest. Also dropped down to easy in boss battles in Deus Ex:HR because screw boss battles in that game.
What I don't like is when a game only lets me pick a higher difficulty after beating it once. There's no excuse for that, even with Diablo clones.