I also missed an entire mistake which can make or break a movie. This is so important.
The lack of a protagonist in which you can identify with.
This means if the people in the movie are stupid, and you know longer care about them in some fashion, the movie is doomed from start to finish.
Such can be said about a movie I just purchased. Skyline. The first mistake is that it was written and produced by Special fx guys, and not regular movie dudes.
What it tries to be is a drive in romp via 1955 Invasion of the Neptune Men or something equally as horrible. What it turns out is a virtual who's who in Sci-Fi entertainment. The characters are paper cut out throw away targets. And the ending is nothing less than a CGI cartoonish nightmare.
Rent Skyline for it's fun special FX. Do not buy this film.