yeah, that was pretty dumb. it's already deleted. Maybe I'll do the extra modes one day, but man Sigma 2...how could I forget how boring it is.
Iconoclast can come in here with a more technical analysis I'm sure, but I think Ninja Gaiden 2 is great.
It makes a number of significant improvements to the combat and just looks better (performing an Izuna Drop turns enemies into giblet confetti), but I'll happily concede that it isn't as good of an "experience" as Ninja Gaiden Black. Black has some quieter moments sprinkled throughout that even out the pacing and you spend a decent chunk of time grappling with the levels themselves, not just enemies. In comparison, NG2 is all about fucking dudes up and giving you a litany of tools to accomplish that.
I might like NG2 better if the game were balanced better. Normal is more exploitable than a thai prostitute, Mentor starts to hint at the bullshit and confines the moves you could/should use. MNM...way past the point of being fun at all. Having too much shit on the screen at once while being at risk of grabs, guard breaks, etc. is not cool (i know that's ironic since i'm a big mvc3 fan. but that's different.)
I wouldn't say anything is improved in the combat, it's just different. The combat engine in NG1 is the combat engine that game needs and same with NG2. Then Hayashi went just ctrl-C, ctrl-V'ing parts of all the games into later iterations, which did not work out so well.