Nice one but my expectations were higher.
Graphics. Source engine is undoubtedly one of the best technologies developed in couple of recent years. It looks really good and at the same time works fine even on weaker computers. Still I was a bit concerned about it in "DK" as I have in memory the badly optimized "V:TM - Bloodlines". Fortunately "DK" works on Source pretty well, perhaps due to cooperation with Valve. There is only one seriously irritating thing about it - loading times. I have a low end PC and I can't say that playing "DK" with little amount of memory is always a pleasure. Loading times between chapters seem to last forever and loading times within them take simply too long. In "HL2" it is like 10 seconds or something and here... :/ Besides that the game works and looks very nice. There are some bugs on certain graphic cards (yes, on mine of course) with i.e. playing cinematics or some spell effects but you know, there are patches that fix most of this problems.
Sound. As I have only a stereo speakers and common sound card I can't say much about the sound. In my opinion it's just ok, all sounds fit quite good to all the actions that take place in the world of the game. Music is really nice, very fantasy-like. There could be more of it, but it's okay anyway. And last but not least, voice acting. This element of the game is very good. All of the voices fit just right to their characters and sound pretty good. I especially liked performance of actress playing the character of Xana, Moon Dailly I think is her name. What a magic name, don't you think? ;) Maybe only the voice of Demon Sovereign is somehow too low, and sounds like a stereotype monstrous villain, which is even a bit grotesque, but maybe that's just my impression.
Story. Yeah... the story... After launch trailer I thought that the story can be interesting, maybe even intriguing. In that place there is a dull, predictive as hell story with a cliche dialogue that we've seen in games a thousand times now. But you know, it's no RPG, it's no point-and-click Myst-like adventure so developers probably thought that no one would care for a great story in strictly action oriented combat game which "DK" in fact is. Ok, it has it's moments especially with excellently made cinematics but it's just not sufficient for the whole game.
Combat. This game is all about combat. Combat system is far from perfect however, even if it's repetitive (because it is) it's so entertaining that it just keeps you playing all the way to the grand finale... which is actually very simple. The final boss is pathetically easy to beat but nevermind that. As I said, it's far from perfect, from games such as superb "Blade of Darkness" but it's just plain fun when you cut off the head of some guardian or stab him in the back and so on. Therefore "DK" is quite a violent game. The blood pours everywhere as we can slice the bodies of our opponents as we like (with a bit of luck;). So it's no surprise that the game was rated M for Mature - oh, and as for the rating there are also couple of shots in cinematics of nude female demon. There is not very much of it but as a straight guy I must admit that she's hot :D
Concluding, "Dark Messiah of Might and Magic" has many glitches and there are things that could be made a lot better but it's still a well made game that can give plenty of fun.