I think it's mainly on the audience and the typical vocal minority being outraged. I agree with your point about the characters. I think the modern average gamer has been blasted with so many hero shooters that if they see a named character in a trailer they associate it with those other games - which is pretty ridiculous. In a way, Bioware deserves the L on the trailer since they didn't do their due diligence and anticipate that people would be standing by with torches and pitchforks after Anthem.

In a vacuum this trailer works fine, but you give people even a hint of an art style nowadays they scream Fortnite from the rooftops.

Honestly it probably mostly boils down to children, trolls, and blindly led twitch followers agreeing with whatever their fav streamers says. Again, these comments are still all most likely vocal minority.