I'm two episodes in, and bracing myself for the less-glowingly-reviewed final episode later this week. Like many above, Sister Agatha is the highlight of the miniseries to me. When that scene ended with her asking Jonathan Harker if he'd had sex with Count Dracula, I thought "uh oh, here comes the edginess for edginess' sake," but she quickly won me over afterwards as my suspicions about her being some Lady Jayne-esque faux-modern vampire hunter merely posing as a nun were put to rest. (Mother Superior's question about this being one of Sister Agatha's projects had me in stitches!) Dolly Wells is a glorious revelation, and I'd really like to see a prequel series about Sister Agatha.
As for the title character himself, I'm mostly enjoying him. Claes Bang really gives me a strong James Mason vibe in the role. But he occasionally goes too broad with the delivery and humor; for example, his yelling "LADIES!" at the assembled nuns couldn't help but bring Jerry Lewis to mind, and that's not a connotation one wants with the cinematic Prince of Darkness. Most of his interactions with Sister Agatha were excellent, though.