It's already better than Zach Snyder imho. I like how Gunn is embracing the fantasy and sci Fi aspects of the franchise. My only concern so far is that it seems a little bloated with non-superman related characters to set up other movies. But it's too early to tell uf Gunn can make it work sonehow.
I personally think Snyder's take never worked not because it was dark, rather because he simply didn't like Superman that much, and he was embarrassed of playing him straight. As a hopeful hero.
I know the knee jerk reaction is to favor Snyder after Gunn made fun of conservatives with his creature comandos. But I will remind you that Snyder made very clear he is not in the side of "the chuds" either, and he distanced himself from anti-SJWs YouTubers. And outright implied they were hateful despiste the fact they were the most vocal supporters the Snyder cut.
In that regard neither of them are that much different from the other.