Well, my Ninja Gaiden II review is up now at thephoenix.com. I hold the original in high regard, but that might be because I was able to simply stop playing once it got too difficult. That wasn't the case here. But I also didn't notice quite so many glaring problems with the game camera in the original, possibly because I never got past the second boss. In the sequel, the capricious camera had me tearing my hair out at points.
What's either the best or worst part about Ninja Gaiden II, depending on your point of view, is how much of a throwback it seems like. If not for the fancypants visuals, you might think you'd stepped through a wormhole and were playing a 16-bit sidescroller. It's just hordes of enemies strewn along a linear path, culminating at the end of each level with a brutal boss battle. There's no more sophistication than that, and I think for a lot of people that's the game's biggest selling point. I might have appreciated it more, too, if I hadn't been so busy trying to avoid another control pad stress test.