what do you mean when you talk about userbase? if you are talking about latest figures, competitors have bigger userbase if their shares are combined....
how many developers competitors have? what about number of devs doing stuff to symbian?
and apps are just flaws of os. naturally you need some amount of different apps in order to customize the device just for you but every app released either adds feature(s) to os or make some feature(s) better.
.......for example apple fanbois didn't like at all when they found out what the workflow is with n900 from starting camera app to get image tagged and uploaded to service x. they quickly changed the subject....