In my honest opinion, I have to say Barny Sornob. Nobody else had the relative bounty which he had, and squandered so spectacularly in such a predictably poor way.
The Haslam and Peters era was a pretty steep dive, and so I don't mind Porterfield's recovery, with the obvious exception of him being a former pig player. At least he did win the Cup against the dirties in red and white stripes .....
McEwan has to be up there, but I also hold up Kendall as an example. Don't get me wrong. It wasn't his fault, and he did nearly take us to unbelievable heights after a dodgy start (2nd bottom when he took over, and no win in 7(?), except Carl Veart's header v Arsenal?). Reaching the Play-Off Final was a major achievement after the end of Bassett's reign, when he looked tired and beaten by Brealey.
What he also was allowed to do was gamble (á la Sornob) a huge amount to get us up. We saw the effects of that for a decade afterwards. We played some nice stuff, don't get me wrong, and Cowans was a majesty in midfield, but all of a sudden Everton came calling, and we were left rudderless again.
A succession of managers in the short term came in then who had as many debits as credits. Spackman reminded me of Francis at Hellsbore, where he had an established squad already. We played some exquisite stuff under him, but that was Pisshead's work, not Nigel. Swap Fat Ron for Trevor, and you'll get my point.
Thompson was never going to be up to it, and Bruce wasn't given a proper crack of the whip. Heath was welcomed(ish) after he'd saved Burnley from the drop after Waddle's terrible tenancy, but was a disaster, which then brings us to St Neil and King Kev II.
Things are certainly not right now, but I can think of worse times.