I liked this film a lot. The actors were great, particularly Potente, who is different in every role; Fürmann, who is also able to play anyone; and Loos, who spices things up (she is also a talented singer - she sings the song "My Truth", heard when one character cranks up the stereo in the lab).
Anatomie is a good horror flick, which pays attention to its characters. It is also very gory at times, and the set design is innovative. It is too bad they had to make a sequel, which is nowhere near the original.
On a side note, two other things definitely worth mentioning. The DVD is not dubbed, which makes for a better experience of the film. Also, make sure to keep watching after the final credits start rolling.