PlatinumGames releases are all SEGA IPs, Thor and most Marvel releases through SEGA as a promotional thing for the movie and are based on the film's licensing budget and nothing else. It is not comparable.
Many people who are literally employed by SEGA worked on every PlatniumGames releases. Just because the core studio originally worked with another publisher ten years ago it all of a sudden does not count as a SEGA game? So what does that make the hundreds of thousands of SEGA staff that initially worked for other publishers in the past? The way you make it sound is if someone who never worked prior who is on on their first day of their first job at SEGA is somehow "More SEGA" than someone who has worked with them for twenty years, but originally worked with Namco or someshit? Makes no damn sense, and I am tired of people with a superiority complex trying to push it.
Outside of Secret Level stuff, which was a SEGA studio, SEGA barely have any say as to what happens with with the quality of Thor. It is Marvel's IP, and as they are in charge of what happens at the end of the day. Of course SEGA could have dropped it, but why waste a potential multimillion dollar deal? In the name of honor? Pfft, every major publisher has at least a dozen bad movie games under their belt, the only time it is ever a problem is when people who do not even buy the games find reasons to complain just to complain.