Ok, I have played Furcadia on and off several times and I will list the good parts of it and the bad parts.
Good: You can walk around and fully design your character. The graphics are very colorful, and the sound is pleasant. You can chat and explore, and turn into dragons, wolves, fairies, and other creatures. You can swim and you can sit on huge twirling flowers. You can create scripts, dreams (fully customizable dreams) and patches. You can also write your own character description. You can roleplay and there are lots of places to go. You can sit and lie down.
Bad: The graphics aren't very good and the sound gets repetitive. The mini-games are boring. It costs money to turn into wolves, dragons, fairies and other creatures. It is confusing to do the script, create dreams and create patches, and the game is barely organized, so it is hard to figure out where you are going. It is easy to get lost. You also can't fight or do many character actions. The game gets repetitive and the gameplay is not exciting.
So that is my review of Furcadia. It is average.