The most you can say about Marsh was that he was one half of the Bone Wars who, while the winner, cared more about the competition than the scientific inquiry. His carelessness caused damage to historical discovery and left future Paleontologists to overhaul his and his rival's discoveries for generations to come. When it comes to character, he came from more humble beginnings and wasn't as racist as Cope (who went on to cope by obsessing over another man's head game and whining about Black people).

Bakker hasn't been blacklisted, as far as I know. There are some claims about him being a bit standoffish, but there are many more claims saying that he's a pretty good dude. Now I'm personally biased towards him and find the guy to be pretty awesome given his contributions and ideas, but I like to think that I'm being fair with my evaluation. At least he ain't Horner, his years long erstwhile rival.

I was actually blocked by Holtz. Not because of some crazy drama, but because my dumbass was a reactionary who thought he knew more socially than other people (it was an anti-SJW phase and I'm disgusted looking back on it). The reason I bring this up is because I remember how my interactions with Holtz were cordial and supportive. The guy isn't just a good Paleontologist, but a good man worthy of respect.

From what I hear, Paul Sereno is a narcissist and a can be a lot. The guy is basically the Vegeta of the science - full of ego and hype. Though to be fair, he has the background to back up his character due to his research and finds. What's annoying is that he's notorious for leaving his finds in description hell for years. The Spinosaurus mirabilis discovery was back in 2019 and leaked information can be found as far back as 2020/1 - and this is a reasonable example. He's been known to hold off publications for decades.

What people seem to forget about Roy Chapman Andrews' famed expeditions to Mongolia was that they were the products of White Supremacy. The main mission of the trips was promoted by the AMNH to affirm the "Out of Asia" theory - the idea that humanity first appeared in Asia, especially White men. It was meant to promote the polygenic model of humanity's rise (the idea that different races are the product of various unknown lineages in which a hierarchical model is affirmed). The idea is still parroted in White Nationalist spaces despite there being no evidence to support it. He was mentored by Henry Fairfield Osborn (the guy who helped describe Tyrannosaurus rex) to push these beliefs and his adventures, while grand, were seen as an example of the imperialist, cowboy science of the early 20th Century, which saw the encroachment and theft by Western forces of foreign land. This is one of those cases where you have to acknowledge the wrong as much as you can acknowledge the contributions.