I always found Justice League to be sub-par. The introduction scenes for Flash and Aquaman were pretty cool. Cyborg's seemed a little rushed, but was manageable.
Love the idea of superman going rogue, and then the league deciding to fight Steppenwolf alone. and here something could've been done that turns Superman's resolve around.That fight scene between the League and him was too rushed. Some clever shots, but none of what Superman's real capabilities. Too little, too soon.
The final fight was quite okay, but it was more like Superman shows up, beats shit up and the fight ends. The rest of the league has done squat. And some of the quirky lines were not really Superman, but more Joss Whedon. Even Batman is whining all the time. Flash was pretty cool.