As in my response to the other guy above, "isn't all that special" really was referring to being able to compete as enterprise software against the set in distribution channel.
Yes, asterisk is great. Its probably even better now than it was a few years ago. Their mailing lists were AWESOME, and just like Linux, if I was resourceful enough, I could figure out what I needed to and if I couldn't, help was just an email away. That doesn't mean that most businesses won't just call Avaya and pull out their check book. Enterprise level software has a way of being completely bogus. Go into any medium to large (and all too often, sadly, even small) companies, and look at the garbage they use, then look how much they pay for that garbage. Then look at how they actually believe in that garbage as being the right choice.
Asterisk could certainly improve its lot in the future by changing its ease of use, and making more of an effort at being in the distribution channel.