[Spoilers inside] Now that I've seen it...
It seems like it was just a huge setup to whack off to Supermans power. I mean, Wonder Woman, Aquaman were no match for him at all, neither was Steppenwolf. It was jarring. I mean, Superman borderline as fast as The Flash, his one arm far stronger than WW's entire body - in a "pulling contest" even, jeeesus.
The only hero that ever got to shine, was Superman, and it pissed me off the others were downgraded to "Superfriends" having to wait for big brother to deal with the bad guy. :/ I preferred BvS style, where all three heroes had their moments, and WW/Superman seemed far closer in power, with Superman having the edge.
I would have liked it better if teamwork was the key, and like Avengers, everyone had something to contribute - kinda like how Hulk and Thor can coexist and both shine, Captain America doing the whole leading and fighting, Iron Man being Iron Man, etc etc...
Also, plot was so very weak, Steppenwolf was pretty lame, soundtrack was non existant, not at all helping me getting "into the movie", specially compared to the previous DC movies, that had epic soundtrack.
Jokes were very "meh", only one pulling them off at ~50% succesrate was Ezra, and Momoa had a good moment too. Kinda liked the dry Batman, but it just didn't fit, because the movie felt all over the place, and didn't encompass me in it's style. CGI was ok, not good or bad, except the bad guy and Supermans face. The "picture/lens" itself felt everyday-ish, somehow - not epic.
One of the good things were the characters themselves, even if some of them felt rushed.
I'll admit, MoS, and specially BvS, were a disappointment to me at first, but when rewatching I came to appreciate them, again specially BvS ultimate edition, as good solid movies. This is not one of those, unless Snyder pulls a miracle with a directors cut/ultimate edition.
I wanted this to be great, but having read the reviews I toned my expectations down alot, but still it was just "ok". A 5/10 from me.