Michael,
That is true. I wouldn't even call DNN a CMS, but rather a content framework. The distinction is a very important one when folks try to compare DNN to something else. So, what's the point? It really is more of a question of 'what you want to do with it?'. I suspect the post was just another twawler trying to get a rise out of folks. Most of us who've worked with DNN know the value of it, and though it's frustrating at times, DNN is my preferred framework. As I said, I use a lot of technologies, and find .Net concentric apps and web frameworks much easier to use for 'need it now' situations.
I use Linux/HPUX and their related technologies to work with disparate data islands, which require mostly text manipulation, which is quickly done with the Korn Shell Script, awk, sed, and other tools. However, when it's time to actually use that data, I rely on .Net technologies for presentation, because that's what the bulk of my clients have for desktops. DNN is what we like to use for Web apps, because of it's ability to provide the framework, and allows us to build our custom solutions with existing modules, or new ones.
I do a lot of work with newsfeeds, and when I get a feed to present, I just have to tweak the xsl to change the presentation, in Joomla, I have to tweak the code, and use PHP. Seems silly, when xsl allows presentation changes to be made with much more simplicity. But, in defense of those technologies, it could be a matter of experience, too, which makes it seem so.