There's a huge bias in that managers are only going to be complaining when they lose. They'll gloss over it when they win - but, given that their jobs rely on it, they are probably happy that decisions are more accurate.Those that don't have it, want it. OK but those that have it, managers, players and fans, never stop calling it. Perhaps they are fed up with a product that doesn't do what we were promised it would.
I bet the clubs and managers (and likely players) would vote for it again every time.
For all the fuss about individual decisions, the only major argument for me is that it changes the dynamic of celebrating - especially in the ground. That's a problem because it's a negative even when the system works perfectly.