As long as the failure/deaths are fair than I'm all for it. The game does still have to be balanced, but difficulty doesn't really bug me too much.
Dark Souls and Demon' Souls, I do like, because most of the deaths are from not knowing the level (pits, and traps) or not knowing the enemies, or not timing things correctly. However, shooters, I don't play on Expert/Insane/Veteran, since you can't always see what's attacking you and you die in 2-3 hits...
I like challenge, not frustration.
Dark Souls and Demon' Souls, I do like, because most of the deaths are from not knowing the level (pits, and traps) or not knowing the enemies, or not timing things correctly. However, shooters, I don't play on Expert/Insane/Veteran, since you can't always see what's attacking you and you die in 2-3 hits...
I like challenge, not frustration.