Documentation really important

Here (in ignify) ,The project I am dealing with have lots of webservice calls. and hence a quite a good amount of client server communication. The UI is in flash (obviously ) and uses .net webservices. I could partially implement the model-view-control architecture but not fully. The worst part of it was the documentation. when I prepared the document of so called "class diagram document " I was happy and I was really happy in myself that I did some systematic job. But when I sent it across to the seniors, I got a pathetic comments on it. Even when I got it reviewed from different people , I got a comment that , document is very poorly written, No enough of information, the class Names , Method Names and even properties are not properly explained. This is was bad. I need to improve more and more on this.