Since the WB/DC strategy is now to put out such different movies, we should get used to different results as well, that can still be relative successes. This is different from Marvel which had the lowest budget at 130 million for Ant-Man, which also made "only" 510 million, the lowest after Avengers came out. Marvel will not be making a 80-100 million movie anytime soon.
With Joker for instance, I'd say it could be a megahit because it's the Joker, but if that movie makes like 250 million it will still be a very good performance.
If the movies are good and the profits warrant more of them, I'm not complaining.
The downside is that DC movies won't be "reliable", the brand won't guarantee anything. Some Marvel movies would make half the money they made without the brand.