Justice League RT scores are out [at 37%] and the critiques are BRUTAL
https://www.rottentomatoes.com/m/justice_league_2017/reviews/
Examples:
Justice League isn't funny, because it still believes it has something important to show us. It doesn't.
Full Review | Original Score: 5/10
Bill Gibron
Film Racket
November 16, 2017
a weak, wonky mess with laugh out loud lines
Full Review | Original Score: 2.5/5
Top Critic
Jonathan L. Fischer
Slate
November 16, 2017
Even the strength of Superman couldn't turn this ship all the way around.
Full Review
Top Critic
Chris Klimek
NPR
November 16, 2017
A C-grade B-movie wherein all involved fully satisfy their contractual obligations.
Full Review
Top Critic
Alyssa Rosenberg
Washington Post
November 16, 2017
Everyone involved in making "Justice League," and everyone who will eventually see it, deserved something better than this.
Full Review
Brooke Corso
The Monitor (McAllen, TX)
November 16, 2017
When Justice League is good, it is fun and flashy and slick; when it is bad, it is maddeningly so because there are no excuses for its flaws.
Brooke Corso
The Monitor (McAllen, TX)
November 16, 2017
Peter Howell of the Toronto Star had this gem of a quote about Justice League:
“The film is marginally better than last year’s sour and dispiriting Batman v Superman: Dawn of Justice, but that’s like saying that dental surgery is preferable to passing a kidney stone.”
Soren Anderson
Seattle Times
November 15, 2017
"People of Earth! Rejoice! The Justice League is here to save the day. Listen. Do you hear that? It's the sound of one hand clapping."
... OUCH!
PS - this one actually cracked me up:
Kyle Smith
National Review
November 16, 2017
We've seen bad DC movies and bad Marvel movies. But Justice League is something new: It's a bad DC movie and a bad Marvel movie at the same time.
And there goes the DCEU