I think the problem with the PSL and to a degree the IPL are the pitches.
I don't know if it's just where I've been bought up but for me one of the great spectacles of cricket is a fast bowler running in bowler a hostile, threatening spell of bowling (Think Mitchell Johnson when he tore us apart in the Ashes), in Dubai/India the pitches are just completely flaccid and offer absolutely nothing to the seamers and make them cannon fodder which, to me anyway, means the competition loses a certain something.
For me, the BBL is probably the worst quality of the lot (RAM slam & Blast are close) but is the best entertainment of the lot to watch as it rewards talent in all areas of the game.