The comments by Mark that were covered in the earlier Phoronix article claim that attacks against Mir are only on political grounds, calls them as the "Open Source Tea Party", say they suffer from the "Not Invented Here" syndrome, and sharply criticizes systemd.
Aaron Siego of KDE, who is in support of Wayland, calls out Mark on his critical comments. Aaron has challenged Mark to a public, live, Internet debate to discuss these topics. The challenge was made via Aaron's Google+ page. There's plenty of comments on the page, including from Jono Bacon, Martin Gräßlin, and other open-source developers.
There's no word yet whether Mark will accept the debate.