Other than slightly improved graphics engine plus a leaner new look of the main character Onimusha 2 is the same old affair as Onimusha was. Therefore I will use the same review as the one I wrote for the original titles.
The gameplay in my opinion was extremely limited and extremely boring. Onimusha 2 remains in effect not much more than a hack-em-slash-em type of title. I know that this genre is revered in Japan but it's something I don't enjoy playing (you'll see my similarly low scores for the Dynasty Warriors franchise) at all. The gist of the storyline is the adventure of a Japanese warlord who is avenging the death of his family. There is nothing more to it really. The cut scenes are pieces together rather clumsily and feel like portion of a bad Japanese anime.