Marquand as a director is a lot like Gareth Edwards. Good with action and special effects, lackluster on characters. Return of the Jedi has that aspect to it that I don’t think would have been there without him.
I actually believe the situation is quite the opposite. If I recall correctly, the ‘Empire of Dreams’ documentary makes a point in saying that Marquand was particularly bothered when having to shoot things that required mostly post-production work to fill in the gaps. He found it difficult to imagine the sets and locations with all the effects added. Also, I remember the actors and other crew being interviewed and saying that he liked to focus on character driven drama and dialogue, as he had a background in acting himself. I’m probably wrong, but this is what I remember taking away when I watched it. I never really knew too much about him beforehand. 😕