I have no idea why this got review bombed so hard, but it's not a bad movie. It's entertaining. The casting is not like the games, and the storyline is not like the games. Once you get over that you can relax and enjoy the movie for what it is: a fun hour and a half.
It's not a 5 star movie, but I'm giving it 5 stars to cancel out one of the many ridiculous 1-star reviews. In reality this movie is about a 3 1/2.
My only major complaint is that Borderlands takes place in an R-rated universe, but the movie was made PG-13. They sacrificed the quality of the art trying to sell the maximum number of tickets. That's a serious no-no.