There is probably not a whole lot on the plot because it will be lacking in that area. I was hoping they would make this one a whole lot better than the last. Maybe they will, who knows?
I enjoyed it. The action comes in bursts and nowadays most people don't have the attention span to watch a movie unless it is all action all the time. Make sure to hang around a minute or so into the credits for the teaser tie in scene for the next X Men movie.
The problem with Wolverine is that there is limited sword play in modern life. They set it in Japan to at least make it plausible that there could be a fleet of sword/arrow wielding ninjas...