Well I saw it last night and went in thinking it'll be at least passably enjoyable.. But how wrong I was! It was an unmitigated disaster. There be spoilers below.
Honestly I don't think even an extended cut can save it either, it's obvious Zacks 2 part vision was severely compromised by the studio even before they canned him / he walked off or before Joss stepped in.
The opening credits, total zack style, the world going to hell... Leading to some super campy batman scene that looks like it regressed even past Batman 1989? Really Joss, is that where we are nowadays? When he was holding onto the parademon and floating around it looked so damn hokey! And we went from him taking out a room full of trained martial arts killers armed with guns, freaking flame throwers and grenades in no time in BVS to playing hide and seek behind a water tower with one fat dude with a gun?
No question that was Joss. Well there's too much to complain about lol so I'm not going to get into all that. I'm just going to talk about superman. Suffice to say there was only one moment in the movie I really liked. And that was when they were fighting superman and he was holding them all at bay and flash runs up from the side and Superman has that insanely cool/creepy head turn/ stare down. Pure awesome, like a comic page come to life.
The rest was ****. Joss even made Supermans suit look bad somehow, it just fit oddly or something and he has no eye to see that it's not sitting right. And his weird superman close ups where you can see how crooked Henry's teeth are. Dude, if you want me to believe he's not British don't show me those teeth lol. There's a reason in 2 movies as supes I never even noticed that yet!
And worst of all though some people like the direction they took superman I feel it wasn't earned in any way. He didn't learn anything, he didn't say he had a new perspective after death for whatever reason, nope, I'm back as a cartoon cutout 'hopeful' version of myself now for no reason. And his whole resurrection plot was insanely dumb too, there were a million ways to do that better.
And lastly after all the excellent action sequences in mos and BVS superman basically just punches things a couple of times, does his ice breath, and floats with his cape in the wind very much like Superman the movie... Which was made in 1978...
And then there's elfman. Honestly as much as I cared before I don't anymore coz his music actually goes fine with the rest of the turd sandwich I just saw.
Well I hope in all the cut material there's something worth putting together an extended edition, but only if they excise every single frame Joss shot and replace every single Elfman note. I hope so but I'm really doubting it. The original story with part 1 ending with Supermans resurrection as a warlord and the JL losing to him and steppenwolf to be saved by lanterns sounded so much cooler.
4/10
Oh one last note. What the hell was up with that one random ass family
I don't care much about that, just illustrating Joss poor shot composition that makes them look worse than they are. And I don't think all British people have bad teeth lol. 
