Wonder Woman was good. Quite good. While calling it "the best DC movie ever" is damning with faint praise, it was *actually good*. Like, "comparable to several Marvel movies" good. Not just "good for a comic book movie" and DEFINITELY not merely "the best DC movie ever", actually good, compared to other movies that are good, not just "good for X".
Wonder Woman appears to have finally figured out that if you make a movie *not suck*, it will get good reviews and attract audiences. However, it's DC and Warner Brothers: The odds of them doing that *again* for Justice League are extremely long, and that makes me sad.
In the mean time, Wonder Woman was really good. Go see it, encourage DC/WB to try to make more movies that aren't god-awful.