Very difficult for me to rank, but I'll give it a shot with one caveat. I'll put them in groups of 2 in which one doesn't come above the other.
Abigail - lush production, great atmosphere, mostly great songs, love the story (probably the best)
Them - great songs but hokey story, so-so production
Conspiracy - intense riffs and playing, Mickey Dee on drums shines
The Graveyard - easily the creepiest story of all, production somewhat dry
The Eye - great songs and story, yeah the drums sound weak
The Spider's Lullabye - a grower, nice variety of songs and riffage
The Puppet Master - cartoony story but great songs, lots of humor, clever use of synesthesia
Give Me Your Soul Please - solid album, in a similar vein to Puppet Master
Fatal Portrait - transitional first album that sounds a lot like Mercyful Fate (as well it should), killer riffs and tunes, not sure why I'm not ranking it higher
House of God - catchy songs, a lot of moments remind me of other metal influences but not in a bad way, not very sinister-sounding, kind of a happy album
Voodoo - intense playing, but the songs are not very memorable
Abigail 2 - the hardest KD album for me to get through, maybe need to give it more spins