The idea is clearly Wonder Woman outperforming Batman and Superman in the eyes of the audience.
So yes, obviously you can take from that the negative aspects if you choose to. But the vast majority of the reaction to Wonder Woman that I've seen has been a positive celebration of the movie's success, and so I took the meme in that spirit. It has surprised people by how good it was, and people feel positive about it (and more positive about DC movies overall).
I haven't seen many people using the Wonder Woman movie or the meme as an excuse to denigrate the previous DC movies, but I guess you could take that view if you wanted to. Maybe I'm just hanging out in the wrong places online.
Regardless though, hopefully we've not reached the point yet where a celebration that a DC movie is their best yet is going to be treated as a de facto attack on previous DC movies.
I was one of those people who thought Man of Steel and BvS were both ok movies with good points and bad points, and I don't really have strong feelings on the DC movies one way or another. It's going to become tiresome though if their future films can't be discussed without this negative context hanging over them, perpetuated by both people that want to constantly attack those movies and people who want to fervently defend them.
I guess I just feel like it's time to move on.