I am giving it a three. It is playable but it is not all that fun and not much sets it apart from other games like this.
Possibly part of the problem was there were not many people on when I played so more people may make it better.
An issue is that random menus keep on popping up especially for furnace 2 even if you have not built it yet and are not near someone else's table. Also the small sword does not seem to work.
Here are some other non technical issues. For some of the resources there are only one source so if someone wanted to they could put up walls around these sources and anyone new would not be able to build anything to tear the walls down.
Also the cannon seems to be able to destroy any wall in just one shot. So just one cannon would need to be built to take someone out probably no matter what they built.