Girlfriend and I started and finished the series over the last month. Overall I liked the show and enjoyed the amalgamation of all the different classic horror stories. Casting seemed pretty solid. And I enjoyed that the series didn't stick around too long and ended before things dragged on and stopped being interesting. I'll try to break down my thoughts into sections for each season.
Season 1
Compared to the seasons that follow this one, it feels fairly grounded and did a good job of introducing the supernatural into a fairly believable world. The main plot to find Mina itself didn't seem that compelling, but the characters invested in finding her are what made that plot work. The entire subplot with Frankenstein and the monsters was pretty interesting to me and I wasn't expecting the twist that Proteus was actually his second monster. The conclusion of the entire plot to find Mina was pretty satisfying for me.
Season 2
Enjoyed this season quite a bit. Its one of those cases where directly upping the stakes in terms of threats worked. Season 2's villains felt like the most straight up terrifying ones to me, mostly because of how the show handled their ability to seemingly pop up out of nowhere all the time. Weirdly enough, I found myself slightly more interested in the Frankenstein storyline again this season. I was expecting that the twist was going to be that the monster was going to fall in love with the blind girl (partially because it seemed so obvious), and the twist that happened with that girl and her family was a bit unexpected but welcomed, and the end result of what happens to them felt pretty deserved. Lilly going kind of crazy at the end of the season felt out of left field for me but I'm glad season 3 fleshed that out a bit more.
Season 3
I really like that the spread out the core cast in this one and kept everyone separated for most of the season. It made their reunion at the tail end of the season more satisfying plus I think it gave every character a good chance to shine on their own for a while. Loved the Dr Jekyll character in this season and loved how they handled his transformation into "the monster" of Mr. Hyde at the end. Dorian Grey's side story this season straight up made me laugh at times because you could actively see him becoming more annoyed and bored as everything was happening around him.
I have to admit, I don't feel like I enjoyed the conclusion of the finale that much or necessarily the last two episodes regarding the Vanessa/Dracula storyline. After spending the last 2 seasons fighting off the influence and temptation of the devil as well as Dracula, her sudden giving in to Dracula felt kind of out of nowhere and out of character to me. It was to ultimately reach the spot where Ethan has to kill her, and I was okay with that conclusion, however the circumstances leading up to it felt weird. Also, them never truly defeating Dracula seemed odd to me too. Dracula sees dead Vanessa and then just sort of just goes "peace" and vanishes... like, wouldn't he be pissed and want to kill her friends or anything? I dunno, maybe I'm being nitpicky but the ending just felt a touch rushed.
I'm talking a touch too long so final thoughts
Show was fun, I'd recommend it. I liked some of the little easter eggs they thrown into the series as well (like the Imhotep reference in season 3).