Open Culture says:
At that time, The Adventures of Prince Achmed did not, of course, even faintly resemble any feature yet made. “No theatre dared show it,” Reiniger writes, “for ‘it was not done.'” And so they did it themselves, screening the film just outside Berlin, which led to a show in Paris, then one in Berlin proper, by which point Prince Achmed and his magic horse were well on their way to a place in the animation history books.
Rotten Tomatoes has a critics score of 100%.