THERE IS a moment in the ’80s-set film “X-Men: Apocalypse” when teenage mutants are exiting a screening of the then-new Star Wars release “Return of the Jedi.” One of them notes that the third film in any trilogy is “always the worst.” The line registers like a direct dig at the widely derided “X-Men: The Last Stand,” the third film in the initial trilogy of the X-Men franchise.

Yet while “Apocalypse” director Bryan Singer might be meta-heckling Brett Ratner’s 2006 movie, let’s hope he’s also aware enough to be self-deprecating there: According to critics, his own “Apocalypse” — yes, the third film in this X-Men prequel trilogy — is even worse.

The latest X-film, which arrives late Thursday, is being deemed so mediocre by critics, it currently ranks below even Ratner’s “The Last Stand,” which has a score of 58 on Metacritic; Singer’s “Apocalypse” now sits at a Metascore of “51.”

So where does “X-Men: Apocalypse” fit in among similar flicks this year? If early reviews are to be believed, it’s not as polarizing as “Batman v Superman,” but it doesn’t measure up to “Captain America: Civil War” either.

The reviews may be decidedly mixed, but the critical reception registers as more disappointing because it suffers by comparison, landing right on the heels of the mostly lauded “Civil War.” The reviews also bear particularly disheartening news when you consider that every prior superhero film directed and/or written by Bryan Singer had received a “positive” aggregate score on Metacritic.

Barring an 11th-hour surge in positive reviews, “Apocalypse” will be the worst-reviewed X-team film ever — ahead of only the solo installment “X-Men Origins: Wolverine” (Metascore: 40), the 2009 movie that was so misguided, it stitched Deadpool’s merc-quick lips together (thus silencing the very snark that helped make this year’s “Deadpool” such a huge hit).

So just where does this film — and Singer’s usually sure-handed role as conductor — go off the rails?

A phalanx of critics say that the world-domination plot seems awfully tired in 2016, particularly because for the third time this year in a major superhero film, the crimefighters are pressed into battle against each other on a massive scale. (And for comparison’s sake: “B v S” has a Metascore of “44,” and “Civil War” a “75.”)

“Both ‘Captain America: Civil War’ and ‘X-Men: Apocalypse’ are superhero extravaganzas with severe traffic control problems, but while the former keeps things flowing reasonably smoothly, the latter film … resembles a bumper-car nightmare,” writes the Hollywood Reporter, which adds: “Mostly it just feels like a bloated if ambitious attempt to shuffle as many mutants and specially gifted characters as possible into a story of a resurrected god ready to take over the world.”

The “traffic-control problem” crops up again and again in “Apocalypse” reviews, some of which note that numerous superhero films now groan beneath this weight of ever-growing casts as a means to sate elevating expectations.

” ‘Apocalypse’ feels like a confused, kitchen-sink mess with a half dozen too many characters, a villain [played by Oscar Isaac] who amounts to a big blue nothing, and a narrative that’s so choppy and poorly cut together that it feels like you’re watching a flipbook instead of a movie,” writes Entertainment Weekly.

And Variety writes: “Although the X-Men ensembles are usually large, there are simply too many characters for the action-heavy ‘Apocalypse’ to properly juggle.”

Movie Nation critic Roger Moore, in lambasting the film, finds structural issues doomed by formula: “The epic effects, titanic struggles timed out every 30 minutes or so and ever-growing, ever-evolving lineup of characters of ‘Apocalypse’ … underline the exhausted ingredients of the formula these movies all use. So many movies, so many mutants, with filmmakers straining to find something new to do with them, and watching them try too hard is wearying. They’re joyless technical exercises, as predictable as a video game.”

Slant magazine places the blame squarely at Singer’s feet: “The issue with ‘X-Men: Apocalypse’ is that Bryan Singer suggests so many possible directions to go in and still chooses the least interesting one.”

And Time Out New York blasts the film’s writing: “The script is just nonsense, comprised entirely of sarcastic asides, portentous gobbledygook (“The dawn of a new age will rise!” cries Isaac) and insider references that only the faithful will appreciate.”

Outlets like IndieWire — while lauding Isaac’s palpably “powerful” villain — long for more character depth: “If only these characters were allowed to be as complex as the ideas they fight for, ‘Apocalypse’ could have represented a new beginning for superhero cinema.”

And, in its one-star review, finds that fault especially grievous: “The greatest sin of ‘X-Men: Apocalypse’ by far is how terribly it wastes some of the greatest modern actors.”

The Village Voice review, on the other hand, is noteworthy in its uncommonly high praise: “This film nimbly mixes narrative exuberance and emotional depth, flamboyant displays of power with quietly terrifying exchanges. It zips along, combining the highs and lows of a real comic book – all the feeling, color, and wonder, even some of the dopiness – with gloriously cinematic storytelling.”

And the Chicago Tribune puts the film within the context of the superhero year so far. If “Civil War” is “the good one” and “B v S” is “the bad one,” then “Apocalypse” is “the OK one.”

“I’ve seen worse this year,” writes the Trib’s Michael Phillips. “And better.”

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