Having read, and loved, the books on which this film was based, I had very high hopes for it. Unfortunately, I left the cinema feeling a little disappointed.
Ursula Le Guin's Earthsea is a grand and deeply moving epic, and none of this really came across in the film. Parts of it were brilliant, but I agree with the reviewer who said the end of the film doesn't live up to the promise of the beginning, with major themes and ideas left unexplored and questions left unanswered. The potential in the source material was squandered leaving me with a feeling of 'what might have been'. I really think that if they'd followed the book more closely they'd have ended up with a better film.
On the whole, I think it was a fair first effort for Goro. For me, the film was better than some of Ghibli's other works, and overall I do like it. It's certainly worth buying for any Ghibli fan, and shouldn't disappoint too badly (even my non-Ghibli-fan friend loved it). For those who haven't already done so, do read the books, they're fantastic!