[Declan]

It is just possible that you are trying to like the application, without first understanding what it is and what it is for. If you don't first understand what hole it fills, it will be quite difficult to figure out how effectively it fills it.
I don't suppose you are under any obligation to like it, so if you find that Things and Busycal fill your needs, then perhaps you are right in sticking with them.
Omnifocus is a very robust and flexible application that allows for a fairly strict implementation of GTD. You would probably have to buy into the GTD thing first, and then go back to omnifocus. Only then would you see how it shines.

3 hours would not have brought you to this point.