I don't have an extensive history in PS3 gaming, but Ninja Gaiden Sigma 2 was hard for me, especially the MNM. OHKO by bosses, and life-sucking two hits by everybody else. Elizabet gave me chestpain. Also some of the MN and UN TMs were tough w/o a good partner and good skills. My 0.02cents.

singstar on ps3 is very hard to plat

Ninja Gaiden hands down, shit made me rage so hard when i couldnt beat one of the beginning missions(the one when you are on the blimp

Yes, I have to agree that NG (NGS) is very difficult. You have to be technically accurate to win. Usually the game doesn't have glitches that you can blame your losses on. Painful learning process.

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I also found Tron: Evolution difficult, due to the unforgiving platforming and random camera views...I was fighting the glitchy game itself, rather than the characters in the game! Great graphics, but lousy gameplay mechanics.

Nes games and nothing will ever complete with it!