http://www.gamegrep.com/news/4610-games_of_the_future_to_be_fun_not_difficult_miyamoto/ Hard games are fun.
I think things challenging are hard, and the things hard are fun, Resistance is hell lot of fun, so is MotorStorm, so is BioShock (which is fun), Eternal Sonata, Blue Dragon, Halo 3, and I'll be laughing at Nintendo when I play Warhawk and Uncharted and Grand Theft Auto 4 (probably GT 5 aswell).
Everybody and their own strategies to gaming. I think hard games have a fun edge to it too. Easy games don't interest me much.