While they'll be fans who are skeptical going into SL, if Gunn produces a great film that connects with the GA, critics, and fans alike, that will go a long way into easing alot of fan concerns.
At this point , we have fans who think Gunn will do a great job, fans who are skeptical, fans who are in wait and see mode, and fans who are ambivalent
The needle isn't gonna move in terms of changing perceptions about the overall quality and state of WB's DCU based films ,until there's an actual film to point to, and until that film ,impresses most people beyond just die hard fans.
It doesn't need to be a Billion dollar hit with a 95 percent RT score, but it's gonna have to at least go over well with general audiences.