I definitely agree that if you plan on really going pushing wordpress, a cms system can be better.
However, someone who wants to do little programming or messing around with it, wordpress is much easier especially if you have a host who has it as a one click install thing. I have seen end users baffled by Joombla's back end interface, and that interface is not even confusing. My entire fire department, wont touch it. I tried to show them how they can add a user, and they all freaked out. If someone had programming experience and wanted to spend a lot of time getting it perfect, I would say Joombla might be a good idea.
I love Joombla; I was just not too happy when I spent 40 hours one weekend getting it ready for launch. It really is a good product and I will use it on site in the future when I know the growth potential is there.