I'd love to be proved wrong but I think that's the worst appointment we could have made if you're simply balancing up how good they are as a manager, since being relegated with Birmingham in 2011(who spent an absolute shit ton that year?) he's been a failure everywhere, his last good season was 8 years ago, we've appointed a manager who's not been a success in nearly a decade, has failed in the 4 jobs since, and who walked out on Scotland last time he was in charge (and was a failure last time anyway).
What is the point? I would genuinely have rather had McKay, for all that he seems an absolutely despicable person he's got a better management record. O'Neil is similarly a bit of a c**t and people would have had no dramas with him.
I would have absolutely loved Clarke or Ross, Clarke with Ross as his assistant would've been ideal.