Review Writing - Some Tips

I've been writing reviews for years now on Epinions among other places, and have seen good and bad examples of how to write reviews (and, yes, I've written reviews that I'm not exactly impressed with nowadays, though generally I've edited them...)

Anyway, for those of you who might be interested in writing reviews, here are a few tips (with a slight leaning towards media reviews as they're what I've written most of, but I've tried to keep it general):

1. Always remember that you're writing for people who haven't seen the film / played the game / used the product. It's surprising how many new (and sometimes even established) writers forget this.
2. Try to include the sort of details that you would want to know before making a buying decision.
3. If reviewing a book or movie, don't give the whole plot away!
4. Spellchecks are very useful...
5. Proofreading is also very useful!
6. If you're really not happy with a review, don't post it - save it and edit it the next day.
7. Don't be afraid to go back and edit a review once you've posted it.
8. Accept constructive criticism, ignore idiotic remarks.
9. Try to include all relevant details, but don't become bogged down by excessive attention to detail.
10. Explain your point of view if you think it will be different from many people's and will dramatically affect your enjoyment of a movie / usefulness of a product etc.
11. Try to point out both who would and who wouldn't like the product you're reviewing.
12. Write from a personal point of view while keeping in mind the above point.
13. Humour helps keep people reading if your review is a touch on the long side!
14. State your opinion even if you're in the minority (but still keep in mind point 11...)

If more come to mind, I'll add them later!