The sequel is already announced, it won't be too long for probably some kind of teammup duo whether it be Justice League or Worlds Finest thereafter and this movie is probably going to do pretty big numbers at the box-office regardless of if Joe-Schmo prefers Superman to throw large plastic decals at his enemies and save kittens from trees for 2 hours.
I'm still going in with high expectations, though, aware that it's a flawed movie. If you can allow yourself to come down just a tad bit, it still might reach expectations. It's good to know that the visuals are spectacular and the action sequences are jaw-dropping. To know it can get better for a sequel is always a good thing.
Most people are speaking as if it's a failure. It's clearly not going to be. Just won't live up to the critic expectations and some fans-alike. Most reviews considered negative still have a flow of positivity intertwining with one another so some negatives aren't all that bad. Just good, not great.
Allow that to sink in but don't lower your expectations until you see for yourself.