I don't really get his point beyond the fact he doesn't like/get Mad Men. Fair enough the show barely touches the issue of race but does it really need to for him to enjoy it? And the idea that its about them possibly losing their nice well off lifestyles and ending up poor is ridiculous. Thats not the stakes in Mad Men, thats not even a likely threat in Mad Men. Plus he ignores the fact that Don is from as poor a background as you can find and is completely out of place and isolated in the white collar world despite his ability to manoeuvre through it.
Mad Men and The Wire both deal with big themes but The Wires are mostly big socio-political themes like class, crime, corruption, etc Where as Mad Men deals in more personal themes likes loneliness, the constant chase for a happiness you can never achieve and just all sorts of existential doubt. The one thing the guy gets right in that article is that Mad Men does to a great job on gender (rather than race), thats probably its only big theme like that. One incidentally that the Wire doesn't deal with very well. No show go be all things to all men though.