I've played quite a few games and after playing them on Normal the first time through, the hardest difficulty didn't seem that bad afterwards, if anything, there were only slight changes, yes I did notice the difficulty change, but I wasn't really that bothered by it.
But what games have you played where the hardest difficulty made you think, "**** me, that was HARD, not sure if I'll be able to complete this any time soon".
I'm talking about the type of hard that used to exist in some games in the old days, not the hard where there are few saves and obvious game flaws, but the type of hard that makes you grit your teeth and clench your fists.