They had 9 months to port dead or alive 2 from dreamcast to the american PS2 and for a launch title it looked pretty good but really showcased alot of the problems with the PS2. I'm sure if they tried to make it right now it'd look a bit better but not much.
As for a Ninja gaiden 2 ? I'd like an honest training stage that explains how moves and such work , sure I stuck with the game and figured things out , but alot of people out there didn't and got sick of the game becuase of that. I thought the camera worked 90% of the time as well, what the game needs almost is levels designed with the end perspective thought out and how effectively the user can play the game from this perspective. The first person look was a useless feature for the most part and if I really had to dig , some of the feats required to gain those last few life of 1000 gods items were a bit ludicrous(killing 50 dino fiends... ). I'd kind of like the next game to not be hub based, a stage to stage progression would work better I think , lastly - bonus content , having new difficulty modes and eventual tournament based competitions with new enemies and costumes is cool but what I think most people really wanted was a boss rush type mode , every boss fight in the game back to back with perhaps a special hidden boss waiting at the very end if you can get through it all.