My take on it
Tier 1 The OF
Tier 2 Aberdeen, Hibs, Hearts
Tier 3 F/T Teams - Rest of the Premiership, Championship (apart from Arbroath), Lg.1 Dunfermline, Falkirk QotS (?)
Tier 4 P/T teams
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The is obviously some sorta ranking within the tiers, but working it out precisely is best left to maniacs.
Usually there is 1 P/T overperforming and above the worst managed F/T teams.
Some Dundee Utd. fans think they should be in Tier 2 but I'd place them in Tier 3.
Of the Tier 3 clubs the Fakes have been the most successful this millennium, it is for this and the.fact that they try to steal our nickname that I hates them!