It was one of the most original, bleak and clever narratives I've experienced in a long time, although granted much of it has to do with Edgar Allan Poe (whose works are directly used to drive the plot), but I believe this game does great justice to his stories rather than ripping it off shamelessly. If you are unfamiliar with Poe - great - you'll enjoy The Dark Eye even more.
BOO
The only big problem with the game is that there's not much of a game to speak of. It tries to play like a point and click adventure but there are few puzzles - you basically do a lot of exploring and pointless clicking, and this triggers the game to move forward. It's an extremely easy process most of the time - you won't use up lots of brain cells. The other problem is that it's woefully unfinished - lots of missing animations and system crashing.
it's one of those games that's more of a kick to watch than play, so I recommend you watch it on youtube.
https://www.youtube.com/watch?v=YKLCXbk9nbI
Also, here's my full review of The Dark Eye + screenshots of the game
http://www.oldpcgaming.net/the-dark-eye-review/
Graphics 7/10
Sound 10/10
Gameplay 6/10
Overall 6/10