Apple Revisioning

As I try to get my apps into the appstore I had to learn that it is really hard to get through revisioning. I am used to build my android apps and put them directly to the market.
I understand that Apple tries to keep out unuseful apps but they don´t give any appropriate anwer on what is wrong about your app.
I have 5 Apps being revisioned so far and two of them were rejected. After asking for reasons in the revisioning system  I did not get a useful answer. All they write back is that the apps are not useful for common users.

Thank you Apple for letting me in the dark!

Hope the others go through.