No doubt Warner Bros was hoping it would perform similar to how The Avengers did for Marvel in 2012.
Assuming Justice League does manage to secure $675 million worldwide, to compare to other superhero movies, that would place it between Doctor Strange, which made over $677 million worldwide, and Man of Steel, which made nearly $668 million worldwide.
If this were a smaller, standalone DC movie, then such an amount might be more impressive, but this is Justice League we’re talking about.
Alas, even if we account for the home video sales coming in 2018, Justice League won’t reach that $1 billion mark, and may not even end up surpassing $700 million.