The truth of that will be for the DC comics fans to judge, but it’s hard to argue that Batman is probably the biggest and most popular character at DC, so it’s unsurprising that he gets the biggest push from a business perspective.
He believes that all the focus and energy DC puts into Batman is to the detriment of the other DC characters and the DC comics universe at large.
Tony Isabella’s problem with Batman is that DC makes him the center of its universe.