This was a fun movie to watch!
I love these race against time types of movies where the hero/heroine is the last line of defense and only hope. Some of the scenes will have you on the edge of your seat biting your lip (unbelievable as they are). Of course, there were plot holes; this was not a blockbuster by any stretch. But, like the Die Hrad movies that many love so much, this movie was an action-packed thriller.
The biases in many of the negative reviews are quite obvious. They disparaged the lead character's acting, her accent, and the fact that a "woman" saves the day. I would guess that if the lead character was a strong handsome man with a British accent the ratings for the same movie would be higher.
If your expectation is that this movie is going to be like Olympus Has Fallen, you will be disappointed. This is not on that level... but could have been. Still, it's a fun watch.