The main thing that attracted me to SME, at least at first, was the mail server support. There is no other distro, that I'm aware of, that has an easier to setup mail system. On top of that, one that non-techies can administer.
I agree that the interface and scritping can be limiting to an experienced admin, but I think its strength lies in that same fact. For the most part, we want to drop these things in places where the small business owner or office administrator will do ~95% of the day to day admin stuff. We do not want them getting into the 'guts' of the sytem. We want them to be able to add and remove users and resources, but not much else.
I haven't installed Clark Connect yet, but it looks interesting. But from what I can tell, it does not offer any pre-configured mail system. Also, how easy is it for the admin to break the system by doing something he shouldn't?
Regards,
-Dev