I really enjoyed this show. It's a little cheesy sometimes and some action scenes feel very slow and unsuspenseful, also the guy who plays Elvis is not the strongest actor, but apart from that it was great. Solid and interesting world building (the fact that this show is set in Mexico and therefore brings in culturally specific supernatural elements made it even more interesting) , cool characters (I especially liked Nancy) and a good story.
I would say this was one of the best supernatural shows of the last few years. The first one since the early seasons of Supernatural and season 1 of Wynona Earp that really hooked me. I am super excited for a second season, hopefully we will get one. This could be great!