I'd be surprised if you didn't find it at least watchable, seeing as you enjoy Dead Alive, zombies, and of course, necrophilia. It has a good Christmas vibe, a memorable protag, a few splashes of blood, a few bits of gore, and a downbeat ending. The acting is good to passable, and the direction is solid. And again, it has necrophilia, which you love. It's a low budget film, but the director has the panache to make you forget that point. This is his first film; he was clearly influenced by The Evil Dead and Dead Alive in terms of cinematography. On the downside, he employs elements of the grindhouse aesthetic (false grain and cigarette burns).
Is Cadaver Christmas any good? I just ask because I'm in the mood for Christmas horror, but some people just display posters they like without having seen the movie.