Please correct me if I'm wrong, but there's another rule, you have to keep in mind. If the project is very ambitious and the aim is ruther misty and unclear - it is a good reason not to join it. Even if members are active and everything seems OK. Bewear of the soap bubbles - shine, but shortlifed and stupid.

I made it clear to myself from one of the Campaign advertisments. Unfortunatelly, I don't remember - wich one