The Game Suggestion Thread

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Great idea.

Doesn't get much more gothic than Vampire: The Masquerade - Bloodlines. In fact, it fits all three of your criteria: RPG, horror and adventure. It's a great game. Other than that if you don't mind isometric Planescape: Torment and Fallout are both quite dark. Maybe check out the Thief series if you haven't played them, though they're not RPGs they have a ton of lore and are just excellent.

EDIT: I'm looking for a quality stealth game. I've played almost every stealth game there is, even the ones that just barely pass for stealth, so don't bother recommending the well-known ones like Splinter Cell and Thief. I'm not interested in 2D games but if you have any good isometric games like Jagged Alliance that are stealth based that's something I haven't looked into that much. But mainly 3rd person and 1st person games. Here are the stealth games I have played (this could also serve as a list of recs for people looking for stealth games:

Splinter Cell (entire series)
Metal Gear Solid 1-3 (can't get my hands on 4) - not really that stealth-based but they count
Thief (entire series)
Hitman (entire series)
Legacy of Kain 2: Blood Omen
Chronicles of Riddick (both games)
Prisoner of War
Batman: Arkham Asylum
Death to Spies
Dishonored
STALKER series (1 and 2)
Sniper Elite (kinda)
Velvet Assassin
And of course Penumbra/Amnesia

I didn't mention any RPGs because the stealth is usually not that prominent or if it is it is sometimes too generalized to be interesting. That being said the stealth in the Elder Scrolls games is very good. If you have any RPGs that do stealth just as well then I'd be interested for sure. Mainly though I'm interested in games that are pure stealth. I'm sure I forgot a few but these are are the main ones I've played.

Deus Ex: Human revolution is a game that can match your criteria. And I say "can" because it can be made killing everyone rambo-style (you don't enjoy much though) or sneaking and knocking out your enemies (best one). It has a good story and an incredibily good atmosphere, and, making extra missions, the game can last up to 30 hours. I highly reccomend it with a 9.5/10.

Yeah, I already played it - it's fantastic. It was originally on my list but I removed it to remain consistent with the no RPGs thing even though the stealth is amazing (to be fair the levels themselves are fairly linear so to compare it to Elder Scrolls or something open-world would be misguided). It's designed so that it can be ghosted fairly easily, which I find very admirable considering most of the fans were going to play it as an action game.