What not to expect:
-lotsa action and monster hunting
-revenge story

What to expect:
-Slice of life filler
-Monster of the week filler
-Endless flashback filler, sometimes repeating the same flashbacks or parts of earlier episodes
-Plotholes
-Plastic romance between a woman who can't act and a man who looks 15 years older than her(actually 600)
-Characters making dumb choices then crying about it
-A villain who keeps toying with the mc instead of winning when he had the advantage
-A big reveal, hyped up for 15 episodes, accounting to silly little nothing
-Mc who keeps brooding and reminiscing all the time, even when the situation is urgent
-Awesome music and insert songs
-Good CGI with overused stock groaning sound effect
-Actually good action scenes, too bad they are so few
-Melancholy and melodrama
-Poorly written ending that makes no sense lorewise

Overall, a show with a great premise and a good first episode that was brought down by poor writing and was far too long for its own good. The story could have been told in 4 episodes, didn't need 16.