While I don't give much thought to what critics think, this whole thing is like Ian Malcolm's speech in Jurassic Park:
" If I may... Um, I'll tell you the problem with the DC Cinematic universe you're trying to create here, it didn't require any discipline to attain it. You read what others had done and you took the next step. You didn't earn the knowledge for yourselves, so you don't take any responsibility for it.You stood on the shoulders of Marvel, to accomplish something as fast as you could, and before you even knew what you had, you patented it, packaged it, and slapped it on a plastic lunchbox and now, bam, you're selling it, you wanna sell it."
I've always been a fan of DC comics. I didn't become a Marvel fan until much later, probably around the mid to late 90's, but I've always loved them both. I've enjoyed the vast majority of the Marvel films, with only a few I didn't care that much for (mainly Iron Man 2 and Thor 2). Marvel took a risk with these films by putting that Avengers tease at the end of Iron Man 1. When that went over so well, they had to actually deliver on it, and I think they did.
DC jumped aboard the party late, and instead of just rolling with the fact that they showed up late and stag, they tried to play catch up. They didn't have the patience to put in place a 5-10 year plan for their cinematic universe, and as a result, it comes off as sloppy and poorly thought out.
I wanted to love Man of Steel. I thought the trailers were beautiful and evocative. Instead, I felt it was a joyless mess, with a fairly strong first half, that fell apart once Superman, in all his mopey, gloomy glory, showed up. I had hopes that Batman v Superman would be better. It was roughly adapting a pretty kickass Batman story (The Dark Knight Returns), and I never much had a problem with Henry Cavill as Superman in MoS, I just thought the tone didn't fit.
I also think it should be noted that both DC and Marvel comics have both light hearted and serious stories and characters. I don't think one does more than the other, as I've read both Marvel and DC comics for a long time before I eventually got tired of them and started reading more Image and Dark Horse. I'll still read the occasional trade paperback of note here or there, however.
The Marvel movies and shows have a lot of different tones, which reflect the source material. Some comics are lighter than others. I think there's enough variety in tone across the board, while still taking place in a connected universe.
A Superman movie that is bright and hopeful, and a Batman movie that is dark and gloomy, is exactly what we needed. It's what makes the contrast and juxtaposition of those two characters when they meet so engaging. Having a moping, depressed, joyless Superman go up against a moping, depressed, joyless Batman is just boring. While I'm more interested in Suicide Squad and Civil War than I ever was in Batman v Superman, I'm very bummed that this movie isn't being received so well, mainly by the people that have seen it, and not just critics.
I've never been a fan of Zack Snyder, although I did enjoy 300 and Watchmen as pretty decent adaptations of their source material, with the standard translation to film changes. But after Sucker Punch and Man of Steel, I was scratching my head as to why Warner Bros would put him in charge of their cinematic universe. I'll judge Batman v Superman for myself when I see it at some point in the future, but Snyder's track record doesn't have me hopeful.