Some anime start out good, and end badly. Some anime start badly, and become amazing.

Princess Tutu is neither. It's wonderful from the very beginning - and wonderful at the very end. The characters are amazing, the plot is amazing, the art is amazing, the sound is amazing.
Except for the very small faults that I have mentioned above, it is an unbelievably fantastic, enjoyable anime. It's not for kids. It's for people who know how to think, to be intrigued by the countless relationships that each character develops with each other.
It is a lovely medly of music, dance, and art. What else can I say? While I watched this, I laughed, cried, screamed, and got mad. I appplauded the director for the most multi-level and well-wrapped ending I have ever seen for an anime.