Because it was delayed so much and so many scenes were cut it just ruined the film. There was no real storyline apart from a few bits here and there, there was barely any character building so you couldn't really care much for them and it was all around just rushed. There was no meat to it really it just wanted to be action all the time yet the 'action' wasn't even very thrilling and it got boring quickly.
You can't just rely on visuals and sound design when making a movie and most movies are starting to be like this its sad. I was very disappointed with this movie after the long wait. This film was basically the bare minimum so they could get a sequel out to make more money.
What's funny is most of the five star reviews are people joking and taking the mick or people just spamming five star which unfortunately keeps the ratings higher than it should be but still its pretty funny.