People are likely going to be way more accepting of Suicide Squad because other than Harley (Joker and Bats as relative cameos), most don't already have an image in their head of what the Suicide Squad is supposed to be, look like, or act like. That makes it much easier to accept what the filmmakers provide.
With the Trinity, everyone has a image of Superman, Batman, and Wonder Woman somewhere in their consciousness, no matter how little engagement they have with the actual source material. If the film contracts or differs from that image you can get problems if people aren't willing to go with the different take.
What's funny is that the Tyrant / Knightmare Superman has already occupied a space in the minds of some commenters they're already imputing his motives, behaviors, and actions onto the actual benevolent, volunteer, altruist Superman... and criticizing his performance as not living up to the image of Tyrant Supes!