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Actually, I despise reviews that are broken into sections like that and refer to them as "shopping list" reviews. Did I cover sound? Check! How about graphics? Check! They're easier for the reviewer, but they're just not as enjoyable to read as reviews that are more integrated. Don't feel you have to mention a particular aspect of a game unless it really makes a difference. In other words, unless the sound is particularly good - or bad - it's probably not going to impact someone's enjoyment of the game, and therefore doesn't serve much purpose in your review.
Keep in mind, I consider a review of a game and a critique of a game to be two completely different animals. Many people use them interchangeably, and write "reviews" that span thousands of words. A critique should discuss how a game succeeds and fails in every respect. It's an in-depth look at the game as a construct, whereas the point of a review is to simply give the reader an informed idea of what it's like to play the game, so that they can better decide whether or not it's something they'd like to try for themselves.
Best advice I can give you is to remember that you're writing for your reader, not for yourself. A review is not your opportunity to share everything you feel like saying about a game or to show off your encyclopaedic gaming knowledge. I've encountered very, very few games that can't be very well reviewed in 850-1000 words, but plenty of would-be reviewers who spent 3000-4000 words telling you every last thing they thought about the game in question.
A review should entertain as well as inform, but don't try too hard. When I say "entertain," I simply mean that it should be more fun to read than a text book. We don't have to be laughing every other sentence, we simply have to be enjoying the way you put words together. The reader's eye should flow down the page like your words are made of silk. They should find themselves at the end of your piece without being conscious of actually having gone through the process of reading.
I could talk about the art of writing reviews all day. One of my passions.