Layering was great and easy to use and understand once you had the concept. Just think of a file cabinet (cubit). Inside the file cabinet are the folders (forums), each one labeled with what's inside the folder. Inside the folder contains all the information (threads) pertaining to the label on the folder. If you were looking for a thread about apples, look in the "fruit folder".
The problem was that some cubit owners may not have been completely organized or could have been more organized when doing their cubits. I too had problems tracking information in some cubits because they weren't organized and were pretty much a jumbled mess.