One of the worst endings I've ever seen

Rating: 5/10 (3 April 2016)

This was a movie that I really enjoyed watching. It has an intriguing plot, good characters, good character development, good pacing, a bit of well-placed and subtle humor, appropriate amounts of action, but best of all, it keeps you guessing. I was never bored for a second watching this. It's a great example of a psychological thriller that holds onto your attention by interest in the story alone. It was great.
So if I have all these good things to say about it, why the mediocre rating? The answer is the ending. I won't spoil it at all, I'll just give my opinion on it. I don't think I've ever seen a conclusion to a movie that was more disconnected from its earlier parts. It had virtually no relationship to the plot and abandoned every good aspect of the rest of the movie. It was as if the movie went insane. What happened here? Did they bring in a completely different writer for the last part? Did the studio suddenly call the writer up one day and inform him that he had exactly 5 minutes to finish the script? It's really something that you have to see for yourself to appreciate. I don't think I've ever seen anything like it.
I would have given this movie an 8 probably, had it not been for the ending. That's how atrocious it was. Is that unfair? Well, the ending is a very important part of a movie. In fact I might say it's the most important part, depending on the case. You can't create a great movie and then destroy it with the last few minutes, and expect it to still be considered good.
I only realized after looking at this page that this movie is partially a sequel to Cloverfield. I've never seen the first one. Perhaps if I had, this atrocity would make more sense, I don't know. All I know is that taking this movie on its own, as it was marketed, it's probably the biggest waste of a potentially great movie that I've ever seen. Such a shame.