Drakensang may be unashamedly generic, but the game mechanics work well and it's fun to play. What more could you want?
In fact, Drakensang closely resembles NWN2. They have a near-identical interface, generally similar game mechanics and both have generally terrible storywriting that you're better off just pretending doesn't exist.
Drakensang's biggest strength is its innovative skill system. The basic concepts of pen-and-paper play will be instantly recognisable to anyone who's played a D&D RPG, and it shouldn't be too hard to figure out the specific rules - just right click on any given stat or skill on your character sheet to learn how it's calculated.
The beauty of the skills system is that every skill is upgraded individually, allowing you focus on key spells, skills, or stats. With a little patience, any character can specialise in virtually anything. It feels more fun than 3E D&D rules where most abilities are only profitable if you invest all of a character's experience into a narrow set of skills, making it difficult to create genuinely fun multi-class characters.
Graphically, the game is competent though hardly breathtaking - it's a little demanding of resources in terms of graphic output, but any current generation computer should handle it fine.
A lack of polish shows in a few places throughout the game - there are one or two unintuitive quest stages, and the occasional puzzle with an easily overlooked solution - but nothing struck me as jarring to the game experience, and I never got frustrated at the game.
The only real frustrations I had with Drakensang were with the camera controls (which, once again, suspiciously resemble those found in NWN2). The lack of free camera movement makes it difficult to see what's going on in confined spaces, and when issuing move orders rather than holding down the move keys the camera has a tendency to lag behind your character(s). Some areas of the game are particularly frustrating because the low "roof" of the level design forces you constantly swivel the camera back and forth to be able to see what's going on.
All in all though, Drakensang is a competent and fun CRPG, and an example of what I'd like to see more of as a fan of these games. It seems tragic that the pinnacle of the CRPG was in the 2D isometric games like Baldur's Gate 2, and that we've seen nothing to match them since.