Some of these complaints...
Bad acting? No. The acting in this trailer is anything but bad. Not even the kids can be considered bad, by child actor standards. I like young Reed. He's actually kind of subtle, and not the "cute little kid" Hollywood forces down our throats so often.
Reshoots. Which part is it that people believe they reshot, exactly, and what exactly are the issues with it?
The CGI looks okay to me, though some of it in the international version of the trailer is clearly not done. It may not be entirely finished, but it looks pretty good. I don't understand a lot of complaints people have about CGI sometimes. I don't need effects to look perfect...maybe it comes from being a child of the 80's and having to grow up using my imagination with films.
Dark tone. I don't think this looks that dark. Maybe more serious, but "dark"? I dunno. I just don't see it so far. Obviously some of the more intense scenes have a darkness to them, but thats par for the course with superhero films, but there seems to be enough "down time" to balance it out.
Trank's Twitter thing...why do people even care? What bearing on the final film does a man not having a thick enough skin for you have? For all we know, someone's personally attacking him beyond just Twitter complaints. I just don't see why it matters, other than it gives people one more thing to whine about when it comes to Trank.