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Nothing personal gggmicrosystems but I am actually glad to hear that there are applications rejected, although I am heavily promoting signups on my site and stand to loose money, it tells us that there is some kind of manual checking in place and in real time, and that the system is not 100% automated, this is assuring for the quality of the AdSense program.
My old theory was that they allow all that apply in, and later on pull the plug on low quality sites.
gggmicrosystems, how long was it between your application and receiving the rejection?
Best thing to do is to have several pages of worthy content which can be accessed without them logging in. Even if you have pages which require login, I think you might be able to qualify as long as you have some pages which don't need login.