The ailments of DWA in my opinion do not originate with managerial shortcomings - though there are shortcomings - but rather in the concept and story development process. You sometimes end up with properties that are geared for nobody - too intense for the youngest audiences but too simplistic to appeal to older audiences (see Guardians) yet too needlessly convoluted in the sub-plots (like a poorly executed JJ Abrams device) to capture audiences.
If a movie consistently needs to hire and fire several successions of directors before release, there's something broken in the process period.
It's just too bad the individual artists that have to be sacrificed for the good of the company probably knew all this all along. Imagine the poor character animator working on Jar Jar Binks... I wonder what that bloke was thinking to himself...