It's not necessarily bad but it's aims low and undershoots.

Too many one-note (and one purpose) characters, too many storylines that really go nowhere. Low overall consequences and what seems like it should be the main storyline (Logan struggling to heal) is overlooked for most of the movie.

It should be a more personal movie, but offers no more depth than the previous X-Men films.
It could have been cool to see a more mortal Wolverine have to sleuth a little bit but he's just basically the same Logan who just gets slowed down.

The cinematography on the first action scene is cool and kind of Nolan-esque but none of the action scenes are that great and the Wolverine vs. Ninjas scene is very disappointing.

There's enough violence to keep action film fans happy enough and I like the character of Wolverine so I was happy to see him in action in a better film than Origins but it's pretty much just a middling action film.