I love difficult games. Tho I like them when they're incredibly challenging/test of skill difficult, as opposed to "#^$& this game *throws controller through TV in frustration*" difficult. One is a challenge. The other is just BS.
Example - DMD mode in DMC1 was the former. God mode clone battle in GoW1 was the latter. BULLSHIT. Finally managed to get through it and the PS2 freezes halfway through the final fight, right in the middle of a clash/struggle bit. Sounded like two guys getting it on with all the grunting and moaning they were doing (still referred to as such by the four other people that were there at the time).
Ninja Gaiden II looks like an unfinished game....the graphics had no big improvement, and the level designs are really something uninspired.....and the voice work is just forgettable
Sigma 2 won't be a new game... but they could at least improve the basics... and put a little bit of variety on it.