Right now, pretty much all my thoughts on this movie are positive. I'm in the camp that genuinely loved MOS, so continuing on from the groundwork laid down there is something I'm very interested in. I love Cavill as Supes and Amy as Lois especially, so no matter what else happens in this movie, as long as we get plenty of them, I'll probably be happy. The other casting choices have ranged from the surprising (Affleck) to the shocking (Eisenberg) to the unknown (Gadot). But for me, when I think about all of them, I think I can see why the actors were chosen. In the end it will depend on how they are used.
As for the talent behind the scenes, the film will look and sound great with Snyder and Zimmer working on it. Of that much I'm certain. The script? Well, I still like Goyer (at least most of the time) but I will certainly acknowledge that there are aspects of the MOS script that could have been improved, though the same could be said for most other CBMs, regardless of whether certain posters want to admit it. So I'm glad Terrio was brought in to either punch up Goyer's work, or completely rewrite it. The only thing that makes me a little nervous is that Terrio has only written one screenplay before. And while it was no doubt a great one, that's still a lot of faith to be placing in a writer with a limited resume.
But all in all, I'm very optimistic about this film, and those that will follow. Comic book fans overall don't seem to know what they want... they trashed WB/DC for years for not announcing a slate of movies like Marvel did. But then they do so, and they get trashed for announcing too much. Then Marvel does THE EXACT SAME THING a couple weeks later and the world rejoices. Now, granted, Marvel HAS proven more so than DC (up to this point) that they can create a huge, interlocking universe for these characters. But there is nothing here to suggest that DC can't. Even if you didn't like MOS, there are plenty of other characters and movies in the works to be excited about, if you allow yourself to be. I'm certainly pumped for Suicide Squad now, especially after seeing David Ayer's brilliant film Fury and hearing that the film might introduce our new Joker (Leto!).
So for the people who are worried or depressed or angry or whatever... try to relax a bit. It's a great time to be a superhero fan. I finally feel like OUR time has come, because we finally have the technology and talent to really bring these characters to life onscreen. When I used to read a lot of comics (back in the early 90s) superhero movies were mostly garbage (Batman & Robin, The Phantom, etc.). Now, we're in the golden age.