Yeah i can already see a few problems that could be sorted out, though the actually control over Ryu has been updated quite a bit. Controlling him in the first game was basically like a rock --- nothing wrong with that, 'cause it worked quite well with the action scenes, it's just now with the second game --- he's just so smooth to control.
I borrowed a friends 360 while he's away on holiday, and the first thing i did was download the demo for Ninja Gaiden II. I can't believe how much the gameplay has been improved since the first game --- i so want the full thing now! D: