Earlier quoted context omitted.
Where is the awesome proprietary software that has smashed Wordpress to pieces which he referred to? His analysis about relative quality is off the mark. Looking at Photoshop and ignoring Emacs, gcc, gdb, git, Apache, and all the other great free software isn't fair.
From the article: "There are lots of great open-source projects out there, especially in the development world." I think that covers Emacs, gcc, gdb, and git at least... He's not ignoring the great free software, he's pointing out that only using free software means that you give up using proprietary software in the cases where it is better.
I do have one blog on MT and one on Wordpress, and to be honest I'm not sure which I prefer. It's a close call either way. Given what I've heard of Wordpress's scalability issues, I think I'd use MT if I were running a blog with the expectation of large traffic numbers.