- To describe the product being reviewed, to show those who have yet to try the product whether or not they might like it.
- To address the good and bad points of something, that way the creator can improve it.
- Advertising.
The last kind of review isn't exactly the best kind, mind you. >_>
So, then, how do most reviews end so biased? (Except the advertisment ones.)
That's a question I really don't know the answer to. But, hey, I do know some things about reviewing things! At least... I think I do. Correct me if I'm wrong. Please.
First, it's important to thoroughly look through whatever you're reviewing.
Next, you have to try and push aside how much you like or dislike what you're watching, and list the reasons someone would or wouldn't want to spend time with it.
If it's something still in development, you could mention the things that could be done to improve it; such as "running a spell-check on the text would help things immensely", or "less focus on this feature would make it easier for new visitors".
Vague suggestions and statements are things to avoid. ("That spaceship was something" is a good example. Why? It doesn't give an impression of whether or not the spaceship was good, or what about it stood out so much.)
I got about to there, and lost my steam.
So, I'll stop, and summarise what I wanted to say:
A review doesn't have to be long to be good.
List the good and bad of the review matter – however hard it might seem to you to find either.
Try not to tilt it too much to match your opinion. Though your opinion is what the review is based on, there's a fine line between "I love this game, even with its problems" and "I love this game, because it's perfect", or "I dislike this game, but it does have some features some people might like" and "I dislike this game, it's the worst thing ever".
Guess that's about it! Even though I didn't make my useful post yesterday, I made one up now, okay?
...well, hopefully at least slightly useful.