Well, I mean, the justification for AVR is basically that the angel crap pandered to a specific kind of casual player, the brute-force-dumb constructed cards were dominant enough in Standard (and rare enough) that people needed to crack a lot to get copies, and the interest from those two groups overwhelmed the fact that it's the worst-designed set since Prophecy.
It mostly just chaps my ass that he won't admit just how widespread the bad parts were. Draft was awful, sure, but it was also an incredibly stupid set for constructed. Some success with the angel theme and a few individual cool cards doesn't make up for all the rest.
It was a great boon to the standard and modern environements, it appealed to the casual market and it sold gangbusters. Not every set has to be for the hardcore crowd.
In Standard AVR gave us Cavern of Souls, miracles.gif and all kinds of bone-stupid and unstrategic critters. In Commander it produced Griselbanned and obnoxious nonsense like Sigarda and Deadeye Navigator. I mean, opinions can vary on this a lot more than on the draft format, but I didn't find it a positive contributor anywhere.
And it was designed as a flavor first set that gave casual fans something they've been asking for pretty much since day one - angels remain one of the most popular tribe, as we can see from the next FtV.
For me, the problem is that none of the set's bad parts are inevitable results of the angel theme -- instead, they're the result of rushed design, a bad lead developer, and problematic mechanical decisions. Taking advantage of the appeal of a popular creature type is something you can do without being anything like as terrible as AVR -- DTK is a perfect demonstration of that.