So I've finally finished watching this. I've also read most of this thread so will try not to repeat points already discussed.
My thoughts:
This should have been a 6 part series, each part being around 40 minutes. It lacks the structure of a movie. Even at 4 hours, it hit no beats. No "all is lost moment" no "midpoint" shift etc. This could never have worked as a movie.
Slooooow motion shots, ugly VFX, six pack abs, female butt shots, random wank reference, no colour etc... This felt like Zack Snyder's greatest hits album. He needs to be dropped. He just comes across as a dude-bro with no understanding of plot, structure, source material or in particular, Superman. DC can't do Marvel, they haven't got the nuance/put in the time to create this universe. They just need to stick to making separate hero films. Keep them in their own universe. At least for now. You can always merge with Flashpoint later down the line.
Cyborg and Flash needed their own movies before this. Then you wouldn't need any of their back stories, thus cutting probably over an hour of this movie.
I really missed the Aquaman sitting on the lassoo bit. That was my favourite moment from the original.
Talking of Aquabro, what was the point of him in this movie besides saying things like "ma maaan" and "alriiiight" before being disposed of instantly in a fight
Snyder has no restraint whatsoever. This could have been EASILY 3 hours, which is far more normal than 4 hours by limiting the slow mo and getting rid of random scenes that added nothing, like the WW bank scene or Lois Lane getting Starbucks constantly like a hippy coffee fiend.
I did love seeing Deathstroke but all that stuff and the epilogue seemed super rushed. Didn't feel organic at all. I was completely confused (I'm not a huge comic nerd). Why was Deathstroke standing beside Bats at the end when a scene earlier he was bought in to kill him? Didn't that spoil that narrative thread? Did Aquabro die? Another spoiler? Can someone explain that end bit there? I really didn't get it.
Also Martian Manhunter randomly appearing made no sense. Him, and a lot of things, just looked like CW level of graphics work.
I liked Cyborg a lot more here and I always liked Batflek. Aquabro was decent because I find him funny. Flash had decent moments but was annoying. Wonder Woman was atrocious. Clearly cast on looks and not ability. That is a major sin as she is such a vital character here. Imagine Ironman or Captain America being cast as Vin Diesel. That's what this was.
Finally, I think it's unfair to compare this to the JW cut. Put it this way, JW had to take the exam in a public hall, with examiners over him (studio) and a strict time limit (theatrical run). Snyder did the same exam on his own at home and had the luxury to take as long as he wants.
All in all though, it had its moments and I did enjoy the dumb action, which is ultimately the goal I suppose. I'm a massive fan of the Fast and Furious franchise so I'm in no place to slate anything
I had many other thoughts but I'll leave it there for now.