If it was just bad art, I wouldn't have anything to say. There've been plenty of bad artists who've worked on alien comics in the past. But the problem here isn't bad artwork; I don't even think photographing figures is really the problem. Photography is a form of artwork too after all (although I think his photography, when it IS photography, is bad too tbh).
The problem is that it's largely a misrepresentation of his work, and in many cases downright theft (see previous link about published DeviantArt watermark). The theft is what bothers me most. He's getting paid for someone else's work, while the real artist isn't getting paid at all. When I see that take place, or someone like Greg Land steal from Tristan Jones, I see hypocrisy and immorality. Disney (the parent company) is supposed to be a family-brand right? Well, when they let marvel off the hook after one of their artists is called out for theft and that artist goes on unpunished, what message is that sending to younger audiences? At the college level and in grade school, plagiarism has serious consequences (and yes tracing someone else's art is in fact a form of plagiarism), so to me the message they're sending to my kids is that plagiarism is ok.
My son has shown an interest in comics and art; in comic book art specifically. Like any good parent I try to encourage his interests. He's enjoying the marvel alien series. I have not stood in the way of his enjoyment of the series. However, I do show him where plagiarism is taking place and teach him why it's wrong because I don't want him to grow up thinking that it is ok. If that makes me toxic, then so be it. Personally, I think when marvel, and by extension Disney (or any comic book company for that matter), allow plagiarism to go unpunished they're creating toxicity for the real creators out there who are trying to make a living.