A lot of directors and actors/actresses are massive red flags based on the projects that they take on. If they are also working with a star studded cast then it is going to suck so much. The Rock and Chris Pratt have earned their current association with bland movies that suck for example. I still like some older Rock movies from before he became bland action hero who can't show weakness for any reason. Pratt is fun as Starlord, but his other roles are mediocre.

Bland marketing is often a bad sign, where it is hard to tell the thing is different than a bunch of other similar movies. Bland action movies are a great example of this, if they can't pull of a unique impression from the trailers it is most likely going to suck.