First - a bit about the plot. The plot is that Superman is dead (watch Superman vs. Batman to find out why that is), and it seems that Batman and Wonderwoman are the two main characters trying to fill in for him. I do think that both Ben Afflect and Gal Gadot did great with the material they were given. The plot is one bad guy (forget his name) is trying to get 3 powerful pieces so that he can get superpowers (who would have thought?) and take over the world. The Justice League becomes aware of this and realizes he must be stopped before the world is no more. However, in order to stop this insane bad guy, they most rely on the strengths of all of the league characters to be successful.
Now that you know the overall plot, let me go into the 3 new characters : The Flash, Aquaman, and Cyborg. Out of these 3 characters, I think Aquaman has the best potential for a spin-off movie, and after watching a recent movie in the theaters see that a stand-alone movie of him is coming out soon. Cyborg seems confused in this movie - either that or his introduction wasn't very well done. The Flash in my opinion probably shouldn't have been included or his character and dialog should have been re-written. His humor is juvenile and stupid. His dialog is lame. He comes off as annoying and really distracts from the story in my opinion. Now to be fair, maybe that is how his character is in the comic book stories, but in this story it just sort of distracted from the true character development of the others. I like good superhero movies where the characters are good, the humor well executed and the action complimentary. One of the better superhero movies for me was Ironman 3. I also really enjoyed Captain America: Civil War. These movies were able to intertwine many characters, great story and action, and keep the pace so you never got bored. Plus you wanted to root for the heroes and didn't get lost in poorly written jokes that are poorly delivered. Somehow I felt like Justice League somehow missed it in a few places. I thought overall the movie wasn't bad, it just could have been much better with some better writing for the characters and a tighter plot that made you care a little more about the outcome.
TLDR : Good movie, but not great. Could have been better, but if you like DC comics you should still check it out. If you are a Marvel fan mainly, save yourself the time.
