Ok, so this is probably a dumb question, but how do you write map reviews and how do you rate maps?

After playing a map on the left hand side of your screen there will be a box. It is only there after a game if your part in the game is done (so if the game has ended, you have surrendered or you have been eliminated.) Click this box and the review tab will open up. There you can submit a star rating and/or write a review.

Ok, thank you