Personally, I found Manhunter's world to be a little too clean. In Silence of the Lambs, Lecter lived in a pratically condemned building, but in Mann's Manhunter, he lived in what could only be considered large corporation's complex.
You mean, he wasn't placed in an implausible dungeon, but a clean federal facility? And that is a failing?
Hannibal is clean. He is impeccable. He is devoid of any of the baggage of conscience, mercy, pity. He is clinically predatory as he is, himself, a clinician. And Brian Cox was a credible threat. An actual monstrous human being and not the MGM movie monster than Hopkins slid into by the time they made
Red Dragon.
Mann's
Manhunter world is also largely clean, playing in
liminal spaces creating horror through
kenophobia. Dollarhyde was hunting the rich so he was entering large estates. Big lawns. Swimming pools. Upper middle class homes with big windows. That sterile tech style that was popular in the 80s. Empty that already largely empty space of any life and leave blood splatter, broken glass, and police tape, and what was aspirational ideal of the 1980s consumer is inverted into a horrible emptiness. What was once a mess of the ruddiness of life and love is reduced to a palid diorama, an altar of sacrifice for Dollarhyde's imagined entering into alterity.
And what is Dollarhyde's dream? It is to escape his own clean, sterile, emptiness. He is eating the living heart of these empty spaces, fixated on the fertile nexus of family life (young mothers with a "bloom" to them). He wants to enter into their world, but he doesn't know how, so being a crazy person, he tries to kill his way in. In a way, he is consuming them just as Hannibal does.
When Reba gives herself freely to him, vulnerable, but confident in her trust, it short circuits him. This is the first time, or so it seems, that he's felt love and it really f**ks with him. He is overwhelmed by that connection. Predictably, he falls into paranoid jealously at the hint of losing it. The Big Red Dragon finally got laid, took a step towards normal human existence by connecting with another human being, but ultimately destroyed it all because he was already so damaged that he could not risk any vulnerability. In the end, he was trapped in that emptiness.
In short, the whole f***ing movie a mediation on emptiness, loneliness, sterility, and here you are complaining that this world is clean and that Hannibal is not in some fantasy Medieval cell. The point of the film is about detachment and desire and the coldness that we feel in when our needs are unmet.