To me, wikis just seem 'lazy'. Projects that use wikis as a primary form of documentation make users feel like the project is un-cared for, and not worth documenting.
I have absolutely no stats to back this up--but having officially written documentation gives projects a really good 'feel', and makes it a lot simpler for users to get started (IMO).
I have absolutely no stats to back this up--but having officially written documentation gives projects a really good 'feel', and makes it a lot simpler for users to get started (IMO).