I just saw it. Didn't have high hopes for it at all, especially with the reports they were going to try and "Marvel" it up a little more. For the record, I've never kept it a secret that I can't stand Marvel movies (have chosen not to see most of them, in fact) because they're too cheesy with the stupid constant jokes and one-liners. As an adult, I like my superhero movies serious these days.
Overall, it wasn't nearly as bad as I was dreading! BUT--it also wasn't nearly as good as I'd hoped. I still think Batman V Superman is superior. Quick rundown of things I didn't like:
-Obvious CG removal of Henry Cavill's mustache at the beginning was comical and distracting.
-Each movie iteration of Superman's costume (since 2013's Man of Steel) has gotten brighter and more saturated, obviously to please people who cry about it being to dull and dark (because that somehow affects their cheery mood)
-The Superman costume in this movie, in particular, somehow made him look thinner/less muscular (shades of Phil Heath clavicles). Also, it seems like they're overdoing the sculpting in some areas, making it look more like an "armor" suit rather than a simple bodysuit.
-Speaking of suits, looks like they're heading that way with Batman, unfortunately. More parts and a "tactical" look, which I despised in the Dark Knight trilogy. The simplicity of Batman's suit in Batman V Superman was perfect, and didn't lack any "bad-assery."
-Flash's suit is a fucking mess. Speaking of, just the character Flash in the movie was an annoying mess...their attempt at comedy relief (as if we need it).
-Cyborg and Aquaman--just very undeveloped, unlikeable characters.
-For all the hype of Mera, they barely even showed her.
-Steppenwolf was a distracting, CGI mess.
-The way they resurrected Superman was dumb; his initial aggressive reaction to being alive again (attacking everyone) was dumber; Lois comes in and all of a sudden he's snaps back into calmness was dumbest.
-Forced jokes and one-liners, although not nearly as much as I thought they'd do
-Forced Superman smiling, obviously to counter the whiney people saying he didn't smile enough in his first 2 movies (I fucking hate people).
-Ending seemed half-assed and somewhat abrupt. Maybe due to them trying to keep this movie short?
Things I really did like:
-Kept undressing Wonder Woman with my eyes
-Kept undressing Mera with my eyes
-Danny Elfman's Batman theme gave me chills...well done.