Is it fair to criticise a game for being too hard/easy?

[Qwark]

Being hard isn't the problem being unfair is though. Donkey Kong country is rather hard
, but fair so it shouldn't be criticised for being too hard, because that would limit the complexity such a genre can offer. Unless it would be next to impossible to complete those levels, but that rarely is the case. Offering no challenge whatsoever troughout the game and having no difficulty progression makes games boring so that obviously should be criticised. Furthermore completing something that is hard is usually rewarding, but that doesn't hold for things that offer very little challenge.