I find I enjoy dark or macabre-themed games. I like being a bit scared and/or disturbed during play. I like the rush and the dark atmosphere has always interested and intrigued me. So, here are some of my favorites with a... slightly darker than average nature.
• Bioshock, as seen in my other thread in this section.
• American McGee's Alice, also mentioned somewhere else in this forum. My introduction, maybe? Anyway...
• Vampire The Masquerade: Bloodlines
• Resident Evil 4
• Call of Cthulhu: Dark Corners of the Earth
• The Devil May Cry series (not as scary, and a bit cheesy at times, but you
do play as and interact with devils/demons... among other things)
EDIT: Adding more.
• Doom series
• Eternal Darkness: Sanity's Requiem
• Soul Reaver/Legacy of Kain series (they intertwine)
• The Diablo series
• (sure - why not?) Luigi's Mansion
EDIT 2
• Fallout 3
• All my sims were Vampires/Zombies/Werewolves in Sims 2
I'll update if I remember more, but if you guys could suggest any good ones you think would fit my theme, I'd love to hear your input, and would graciously offer mine in return