i would agree with you most of the time on shooters but there are exceptions, like for the Mile High Club achievement in COD 4 you had like 1minute and 10 seconds to beat the level on veteran, which is basically running speed through the level and is probably the hardest thing I've had to do in a FPS till now.
I dunno. It's probably something I've done in wow. I've raided at a pretty high level since it came out.
There is a fine line between hard and tedious. Sitting back and sniping your way through a shooter on high difficulty is tedious. Ninja Gaiden is hard. Many of us older gamers found difficulty from poorly designed games. Unresponsive controllers etc...
Halo 4 on LASO means "Legendary All Skulls On!" The skulls if you don't know are mods you can turn on to make the game harder, including thunderstorm which doubled to enemies health, famine which gives you less ammo and Iron which makes you restart the entire level if you die(no checkpoints) by themselves the skulls aren't bad, but all of them on and especially Iron is freaking insane, seriously don't know if I want to even try another level like that again. Much less try and beat the whole game doing it.