The quality in the dialogue, performances, effects, and pacing varies scene to scene.
The chemistry between the characters is not natural. The history is insisted by forced delivery. Shauna and Jeff have the worst chemistry. It's difficult to say these actors/actresses are terrible. Because without a proper script, and proper direction, performances will vary. Making the pacing stilted.
The pacing suffers most from the writing. The flow in story is jarring flashing back from past to future. And there are many examples of television and film doing this properly. But this show suffers greatly from the ebb and flow of drama, humor, shock gore, etc. And the pattern in which these change affects the tone; so when something dark happens, it is followed by an inappropriate "light-hearted" moment. And then switches back to a serious ominous tone which unintentionally ruins that moment, making it either feel out of place or inappropriate. Characters are irritating, and don't act like human beings. They make decisions that feel like they are only doing it for the convenience of the plot, and not because they are doing it out of the reaction of the environment they are living.
Maybe worst of all, there is very little redeeming qualities I can list. It's very stale and uninspired. A waste of time in my opinion.