Disregard bad reviews, make up your own mind.
*DISCLAIMER* If you hated the first 3 you obviously aren't going to like this one.
In my honest opinion I feel this is finally the sequel we've been waiting for. Selene has emotionally heavy scenes, the action is great, we have two villains with clear motives, and a story that grabs you and doesn't let go. I couldnt be more excited to see this gem in theaters. While not perfect, this is a jewel with minor surface flaws for fans. See it and make Your own opinion!