No sound = No (that) good
Well, lets face facts. The movie was great. Really nice graphics, nice style, nice animation, all great but one thing. I will repeat what the others said. The lack of sound makes the whole movie half as good as it really is. It's like watching a nice movie but you have it muted. It's so bad that it reaches of being annoying and therefore dont want to watch it anymore.
Re-submitining the movie with sound, would give you even highers review scores/votes. But that's not the point. The point is that everyone should enjoy the movie. And not having sound...well read some reviews and you will understand. Still a fine job indeed.