I just want this film not to suck.
Even though it's a studio mandate, doesn't mean they can't turn it around. When life gives you lemons, make lemonade right?. Batman Beyond was a mandate from WB. They told Dini and Timm they were pulling the plug on The New Batman Adventures and wanted a new show that went "younger". Dini and Timm were initially disgusted by the idea, but it only took them 15 minutes of brainstorming in the parking lot to come up with the premise of Batman Beyond and get actually fired up about it. Heard that anecdote from Dini on the Fatman on Batman podcast.
All we can hope for at this point is that Snyder and Goyer's hearts are in this and they're embracing the idea of making the best possible Superman/Batman film.