I share some of your concerns with Snyder, but we still don't know how anything will play out. Until we get some concrete ideas about what the story is, I'll remain cautiously optimistic. For me, that's the best way to approach it.
I know there's nothing we know about the story, but that doesn't mean that the choices being made thus far can't be criticized or questioned or worried about. Execution is king, but in these hands and going on past evidence, I don't have much faith.
That being said, when those first pictures are released, I'm probably going to be excited as anybody. And I'm going to see the movie. So for all my worries, they already have me.
However, despite them probably making immense profit opening weekend, its legs are another question going back to the overall quality of the movie. The hype is already a given, but will the film hold up? I don't think so. I want to be proven wrong though. And I will go in with an open mind like I always do.
This is just too much too soon where it looks like WB is just playing catch up now and just simply riding the coattails. WB's problem is that they think they can be successful now because of what Marvel did. What people are forgetting is that Marvel succeeded because it took risks and is at the end of the day, a studio that only makes comic book movies. If it didn't work for Sony, and in WB's case, and given their track record, is very possible. It's why the bad outweighs the good. WB is just too late to the game.
Not sure if I can change your mind, but I do share some concerns.
I try to be optimistic and succeed most of the time, but I do worry that this film will be a hodge podge of cameos to herald JL, attempts to address plot points from MOS, and select scenes form comics like TDKR that Snyder finds awesome. I worry it will resemble MOS and Rises in the sense that's it's ambitious, but a little scattered. The idea that Terrio's involvement is limited and won't end up improving the script that much (I found the script was MOS's major flaw) is a concern as well.
To counteract that, I try to remember that we're still in the glory days when we can imagine that all of the above won't become truth. Perhaps Terrio's involvement in the script was extensive and we have something worthy of these characters. Maybe the plot and attention to characters will work in tandem like in DOFP. If such things haven't been proven false, they're still a possibility.
The difference between DOFP is that those were all characters within the framework of its own franchise and X-Men has and always will be, team orientated. This is a different animal entirely. These are three iconic superheroes among other big superheroes sharing one movie. Before Justice League. I can't tell what the **** this is anymore. Apparently, the push in date was to make the script fit more in line with Justice League. And here, (optimistic me) thought it was because to make the script itself better in quality. Now that doesn't mean they were trying to do that too. You can have a good writer like Terrio, but that doesn't mean it's going to be saved or good. In the industry, many writers, good or bad are phased through these kind of movies, and when the final product comes out, you wouldn't know who wrote what. I'll use Spider-Man 4. There were some great writers constantly rewriting that thing, but if the rumors were true, they still weren't able to save what it was turning out to be, much less turn out a suitable shooting script.
I still have to remind myself that this is a Superman film.