Princess Mononoke is art in its purest form.
I feel like I could throw in a bunch of synonyms for masterpiece and still not accurately describe how fantastic this movie is. If you've ever wondered why Ghibli is so revered for its work, just watch this.
The music is epic, and is placed in all the right spots. You will feel exactly what they want you to feel when you hear these scores.
The plot is pretty serious overall, and so are the main characters. You will have a laugh here and there thanks to the charming supporting cast.
The voice work for the english dub is also very well done.
Just watch this. You won't be able to look away from the screen while you do.