I mostly didn’t want it there because it didn’t feel right or necessary for Alucard, especially as considering his nature as a dhampir, it didn’t feel right that he’d be so submissive in his response, even in as vulnerable a state of mind as he’s in. I think it would have been more in character for him to snap and be the one who’s predatory towards someone. That said, they were aiming to break him and his trust in humans, and assault is a sure fire way to do that. Again though, I think they could have approached the betrayal in a different direction, without resorting to sexual violence. They could have easily, for example, broken his trust by having him explore the ruins of his mother’s house, trying to find closure for Lisa’s death, and have the villagers that he’d known growing up in Lupu turn on him, as a possibility. It wasn’t the graphicness of how the sexual assault was handled however that was the issue. It was the fact that going for the angle of sexual assault didn’t feel right in this case, as well as the fact that it was assault in the first place. As hey, consent is a big thing.
However on the flip side, it was absolutely right that they explored the way that losing his mother and then killing his father has broken Alucard so utterly, especially with him then immediately becoming self isolated. Of course it’s going to affect one’s behaviour. Push then to do out of character and/or irrational things. It’s easy to see how someone who’s left that broken might respond to attention of that manner at the first chance presented, through craving contact from another person, be it non sexual or sexual. Also, Alucard is a lot younger than he is in most of the games. He’s had a very a-typical environment growing up, with him in some ways growing up faster than the rest of him, regardless of whether you read his throwaway line to Sypha about growing up fast literally as him ageing faster than a human.
Again, it was cool that they explored characters connected to the other vampire generals who were non-speaking. Chō was the coolest of them imo. Again, these characters don't exist in a vacuum. Of course someone would come looking to see what happened. Thus Sumi and Taka arriving. Their backstory was cool and interesting. Their characters however, weren’t. Herein I think lies some of the issue.
Puzzle pieces that quite rightly should exist were put together in ways they shouldn’t. You can see why they are there, even why they went to Dracula’s castle. But personally I think they shouldn’t have been such major characters. They should have shown up maybe in one or two episodes at most and been more background, or at the very least, not the ones to break Alucard in the way he was broken with a major betrayal of trust.
With Hector, my biggest complaints lie in him just being too meek. Yes, this is a gentler Hector than in the games, but at the same time he’s just coming across as too soft, too much of a puppy dog without much spine.
All that said, I honestly really do hope this gets renewed for season four. I want to see where this goes more. I love seeing the world breathing and being explored, and seeing more of the characters existing. It’s something I love seeing in fanfic, and character heavy stuff is something I love in gaming as well, be it in a computer game or in a pen and paper RPG. You can see the love and attention this series is being given by the animator team, you can see the passion for the source material that they have just through following them on Twitter. It’s joyous to see. It’s joyous to see that they are bringing in new love for the series. Something it’s badly needed in the last decade.