How good the Ninja Gaiden port Ninja Gaiden Sigma was ?

[makingmusic476]

I'm tempted to get Sigma now.  I only played the demo, but never bothered to get the game thinking I'd never be able to play the sequel.

But now the sequel has been announced, and I can get the game dirt cheap.  Why not go for it?  Because I have way too many games to play. 

xD