Justice League is a failure on pretty much every level.
That basically sums the take of movie critics around the country.
In short, the film is terrible.
This probably doesn't come as a major shock to anyone who has seen the Justice League trailer or followed the behind-the-scenes problems that have plagued production.
But you should still scroll down to see just how negative the reviews actually are...
Justice League is another attempt to course-correct what some believe were [Zach] Snyder’s botched early entries in the DC universe… The movie wants to be grand, it wants to be fun, but in the end, it’s just another loud, lifeless, high-tech bore
If a D.C. universe movie is truly going to triumph, it needs to add something fresh to the genre. The sight of well-muscled, costumed superheroes standing in a line ready to take charge doesn’t have the same oomph as it did five years ago. Bring on the excitement and the death-defying thrills and kooky humor for the sequel. After all, nothing is more frustrating than a big-budget extravaganza that just flies by night.
New York Times:
The movie shows a series that’s still finding its footing as well as characters who, though perhaps not yet as ostensibly multidimensional as Marvel’s, may be more enduring (and golden). It has justice, and it has banter. And while it could have used more hanging out, more breeziness, it is a start.
I could be projecting, but boy does poor Gal Gadot look so sad in Justice League, watching this lumbering and witless movie lay waste to the nice thing she just got finished making. It really is a shame. What a dumb irony, to end this movie, of all movies, on a note of bitter injustice like that.
On a moment-to-moment basis, though, Justice League often feels fractured. Whedon’s reshoots are sometimes painfully obvious, as when Flash and Cyborg share a brief personal moment in a graveyard that looks as cheap as a first-season Buffy the Vampire Slayer set. While those scenes can seem roughly interpolated and out-of-place, though, they often offer the film’s most meaningful character moments and flashes of humor and humanity. A quick gag involving Aquaman reveals more about him than the entire rest of the film’s two-hour runtime.
The dialogue is painful. [Ezra] Miller’s neurotic routine is initially quite charming, until his one-liners become incredibly cheesy and tired. Aquaman peppers his speech with many dude-brah phrases, while Cyborg, regrettably, utters "boo-yah" at one point.