The hellenics I've spoken with show devotion to Hades, and also Hindus with Kali and Kemetics with Set, but Asatruar and Heathens showing devotion to Loki is somewhat controversial. What is the general input on controversial deities? Such as deities of death or deities of destruction or chaos?
Mind if I chime in, here?
Although I technically only believe in one divinity in many manifestations to suit people's tastes, I do find the darker aspects of the One to be quite appealing in some ways: gods of war, death, chaos, tricksters, and so on are all, to me, aspects of the finite, mortal condition that people would like to pretend do not exist.
I think that for those who do not worship them or are not familiar with them, there is a sort of stigma in dealing with "dark" deities because it is not as common and simply because they are darker gods; it has a sort of bad "vibe" to it for many people. However, even Hades is a god of wealth and riches as Pluto.
I do not think it is fair to consider Kali to be a dark goddess, however: she is Mother, like Durga, and rarely do people think she is a dark goddess. I've always had a soft spot for these two. I have a beautiful picture of Kali by my front door, her bare-breasted self standing on Shiva as she holds the severed head of a demon. It has made for... interesting conversation with door-to-door missionaries and salesmen.