I think the lack of leaks is causing a lot of the negative assumptions. We're so used to getting leak after leak and having damn near entire movies fed to us during prerelease hype that now we don't know how to react to information being drip fed. We know next to nothing about World's Finest beyond it's cast, a logo, and some kind of influence from "The Dark Knight Returns." The movie still doesn't have an official title! So now we, the internet collective, are digesting the bits of news through the lens of what we think a World's Finest movie and a potential DC movie-verse since we have no idea what the actual vision for the project is. Think about how much of the conversation about the casting of Gal Gadot and Jesse Eisenberg wasn't about trying to discern what direction they were going for with the actors' respective characters but instead how Gadot and Eisenberg aren't like Wonder Woman and Lex Luthor. A lot of the criticism for this being a teamup movie revolves around the idea that it should be like the MCU; because since that's the only way we've seen it work, we assume it's the only way it can work. So now we're bothered that WB is going in a different direction. Add in the disappointment still felt from TDKR and the still going backlash against MoS already having folks suspicious of WB/DC, the readiness to believe just about any rumor related to this movie, and not knowing anything about the film beyond it's casting is probably more likely to have people default to negativity, as we are seeing.
