I just think the problem is all you DC fans have been starved of the shared universe you deserve. You've seen DC try to launch the shared universe twice now and it hasn't really gotten off the ground yet. So now here's a 3rd try. It's clearly a flawed movie - even the people who say they like the movie recognize it - but you guys stop short of ripping the movies to pieces cuz you want the DCU to flourish.
If this was just another DC movie in a long line of successful DCU movies, I think more of you would be willing to rip part your movies then. It'd just be a bad movie among a bunch of good movies.
Nah. Here's the deal: Marvel started the MCU with Iron Man while DC was in the middle of a planned Nolan Bat trilogy. Marvel fans pee'd themselves with excitement (and rightfully so), and ALL comics fans were pumped to see whole crossover story-arcs planned for multiple movies. Meanwhile, Marvel released more than their share of terrible movies, too: IM 2 & 3, Thor 2 (and Tom Hiddleston rescues Thor 1 from being trash, too), and honestly, I thought Avengers AoU wasn't all that great either. But people don't rip them apart because they're "fun" and take place in the daytime, I suppose. They're all pretty vapid, very repetitive and are doing their best to drag out the Thanos angle for so long that nobody even cares about him anymore.
However, as soon as MoS was announced and word got out that a DCCU was going to be launched, a lot of people (and I'll say especially Marvel fans) started criticizing WB and DC for trying to "copy" Marvel's plans. And then when the movies turned out to be more "dark & gritty" the complaints were amplified by the mainstream film critics who are basing their reviews in the context of "light & fun" Marvel movies. And then the Marvel fans take to forum boards in droves to bash the DC films over and over and over again.
Do the DC movies have flaws - of course they do. All movies do, including all of the Marvel movies. I love IM 1, but honestly, it gets slow in the second half, and like I said 2 & 3 blow. The Thor movies are pretty boring, and the supporting characters around Thor & Loki are pretty useless (including Natalie Portman, who stinks in these movies, and Idris Elba who is woefully underused). GotG was really good, and was a great change of pace from the rest of the repetitive Marvel movies. Ant Man was pretty good, but most of that is because of Paul Rudd and the sidekicks. The story was pretty dumb. The Cap movies are great, especially the first one. Avengers 1 was good as an action movie, but had no story and a pretty weak "bad guy" (Loki and his swarm of invading aliens). Ultron was a good character in Avengers 2, as he increased his awareness, but holy crap the movie was a total slog, with an even sloggier 20 minute "Hey look, Hawkeye has a family" break in the middle.
My point is, DC fans (or at least me and my friends who are also DC fans) don't go online to attack the Marvel movies for DAYS after they release, and don't keep hammering on them after that, even if we really fon't like them. But Marvel fans do. They don't just say "Eh, the movie was slow, I still don't like Lois and Eisenberg stinks as Lex." They go after the people who say the do like it by calling out their integrity as cinephiles and trying to force them to defend WHY they like the movies. FOH with that crap. I say I like BvS and all the sudden I must be Zack Snyder, or I'm just a fanboy, or I don't know good movies. Because someone else doesn't like the movie's "pacing" or "editing."
Meanwhile the movie (just like MoS) is gonna make a buttload of money, and so too will the rest of the DCCU movies. And on top of that, the DCTVU shows are enormous, while AoS is dull as hell and Agent Carter stunk up its second season so badly it won't be renewed. However, boy do people just love the "dark & gritty" Netflix shows, huh? The ones that always take place at night, and where the hero breaks the villain's neck at the end? And take 10-13 hrs to tell a single story.
It's just obnoxious to have people constantly rag on something I actually DO like over and over and over again. Don't like the movie? Cool, man. Tell us why you didn't like it and then go watch something else. Hop on out and maybe pop back in after you watch the next movie. But this movie is making HUGE $$$ and has a 75% fan approval on RT. 3 outta 4 people who saw it liked it. I'm gonna go see it at least one more time.
So don't try to presume why I don't dislike the film. Dislike it yourself, but let the people who do like it, like it. You do you, let us do us.