Right now Im trying to go back and beat some of my older games on the hardest difficulty setting. I recently got done with Mass Effect 2, and a few parts were a pain, but mostly the final boss was the hardest part in my opinion. I probably died about 20 times before beating him.
Right now Im playing Star Wars Force Unleashed on Sith Master difficulty (hardest). It is a pain in some spots, but I have 3 more levels to go before I beat it. The hardest part so far was defeating Kazdan Paratus. That guy made me want to smash my controller! lol I almost gave up after more than 30 deaths. Finally I learned the technique and was lucky one time and beat him.
As far as my thoughts on Star Wars Force Unleashed...I would say its a great game with a lot of fun quality to it. graphics look kindove dated now, but still it has a very high fun factor in my opinion.