I hoped with the promise on action in this movie that it could be entertaining, but at least for me it failed on that as well.
The movie starts out ok, and succeeds to build a little bit of interest but it falls apart vary quickly.
The side characters have at maximum 3 words to describe them, besides being very horny or angry. The gremlin seem more like lazy story writing than a challenge, the action is so over the top (and predictable) that it removes any suspense that might be left.
Best thing I can say, is that it is not that long.