This game excels in two fields: Story and World Setting.
If you care about story in games, than you must play this game.
I played many point and click adventures in my life, so I can compare to a lot of them, and I truly can't think of one that had a more sophisicated story. When I sat through the ending credits of this one, I was just blown away by the cleverness of the plot and particularly its ending.
I guess that most gamers know all the "usual" fantasy elements well - magic, dragons etc. but the world of this game presents such original ideas that it really feels special and more deep than other fantasy worlds.
I won't spoil it, I'll just say that in this game artifacts and spells do original and interesting things, that we just don't see in other games.
As for the quality of other elements of the game:
- Graphics and Soundtrack: Beautiful as you would expect from Daedalic Entertainment.
- Puzzles: I think that most of the puzzles were great and fun. There were only a few that I found to be awkward, but still most are great.
- Voice Acting: Good but certainly not the strong side of this game, although it shouldn't drive you away from it.
And lastly, just note that this game is a sequel to The Dark Eye: Chains of Satinav, which is also a great game. You can't just play Memoria without playing Chains of Satinav first.
Luckily, it's another great game, and playing through both of them will give you a great journey.