So not to PL but I worked in this industry for a while and have heard Max pitch and it's not hard to see why he was successful for a time. He's good in the room. He's got weird chaotic energy and has some unique and interesting angles to things.
Take it for what it's worth, screenwriting is an extremely hard and competitive environment and while he did have a leg up growing up in the world, we weren't sitting around saying "It's John Landis' kid, we've gotta buy his shitty script."
He is able to deliver on high-concept ideas and some in contained, low-budget ways (I thought Deeper and Higher were good.)
Unfortunately, like most Hollywood children, he's a giant faggot. But I estimate he prob made $15M+ during his young career with spec sales, assignment work and uncredited script doctor work.
Easy now to say he's a hack but he did have a lot of recognition and respect for his ability to quickly deliver solid scripts at a high clip.