I think the Lord of the Rings comparison is a bit disingenuous and misses the point of why people are complaining. No one is saying that Marvel invented the ensemble film nor that audiences brains are too small to keep track of large casts.
No, the two people I quoted said exactly that: "those characters didn't have origin stories, so I don't care about them"; "that villain is unknown by general audience, you have to I troduce it first". And then there's a shitton comments about the casual audience surely being confused because "you can't introduce Flash without spending while movie explaining what the Speed Force is", or "you have to show the Atlantis first", or (like above) "you have to have a movie about why Cyborg is so sad and stoic".
Yes, DC is probably chasing the MCU money, but they are doing their own thing. Instead of slowly building the universe, introducing the characters one by one, they throw a party right away, showing the big picture, and then tell the individual stories. It can be done both ways (and Marvel realized it too by introducing characters like Black Panther or Spider-Man in Civil War, and then making their solo movies with both characters already established). The pros of DCEU way is that with just four movies in we already have an unvierse with aliens, demigods, meta-humans, magic and all that shit. You don't need a slow build up, you just need good script (which most DC movies lack, but that's another story).
Thats why we needed an origin movie first to get all this bullshit out of the way.
Good God, if you people were in charge I'm sure we would get yet another "they killed my uncle Ben" Spider-Man movie after the character was rebooted for the second time. Because you sure can't explain Cyborg's situation in a single dialogue or a flashback scene.
Only if you copy paste the Marvel formula, which is what the DCEU does (...)
No, the point is that DCEU doesn't copy Marvel formula. Otherwise we would have an origin movies for Batman, Flash, Cyborg and Aquaman first. Instrad we got BvS, where the Batman was introduced through the conflict with Superman; and Suicide Squad, where the overall world building started with MoS and BvS continues, while introducing a bunch of new characters and ideas (magic, other meta humans that the government tries to utilize, Batman's villains etc.).