I said this back when they poached James Gunn. I thought it was likely too little too late for DC. Aside from some hero fatigue audiences seemed to be having, it was compounded by the fact that they made him alter his original announcement of no unconnected universes. Right out the gate the studio interfered with his plans. Then they moved forward with Joker 2 and some other films that were not in his plans.
James was supposed to bring order to chaos and some of that Marvel magic. However, I was nervous about it after seeing Suicide Squad 2. I had issues with Superman. Then his announced lineup of coming projects seemed pretty lackluster. Now Supergirl.
Plus, if you look at the announced roadmap, it doesn't exactly light the world on fire. Clayface, Man of Tomorrow (OK, this will excite some), Batman: The Brave and the Bold (this could be good or a disaster), Wonder Woman, More Swamp Thing, The Authority, Teen Titans, Deathstroke/Bane Team up, TV series Lantern and Waller.
A couple of these I don't think anybody is asking for. I am still hoping he can do it, but I had doubts before and now I really have my doubts.