I really disliked M-14, but I thought M-13 was okay.
I mean, the mystery and murder in M-13 was extremely creative (if you went back and watched it over a few times), but also very unrealistic. I've never heard of an elevator holding only seven people, especially in a hotel. Not to mention, the fact that they even allow elevators to be used during a fire is insane. Maybe the safety regulations in Japan aren't exactly the same as in America. Also, the fact that the culprit just happened to take the one thing the BO was looking for and Irish just happened to hear about Conan during his attempt to retrieve to SD card or whatever it was via infiltrating the police department was also really far fetched. Not to mention, don't Apaches have missiles? Why not use them, Gin? You've already gone pretty far having that monster in plain sight, why not have more fun with it?
But other than that, I still consider it a pretty decent movie, and it's still a lot better than M-14.