An unusual example of a Twine game which has good points, Rites of a Mailmare is little more than an excuse to show off some pictures. They are well drawn.
Although it should be a 2/5 by normal standards, it a 5/5 by Twine standards, hence the rating.
It is an interesting experiment in using objects to represent and communicate with other players asynchronously. If you're interested in exploring and editing a mostly static world, it's good.