I personally never found Ezra Miller as annoying as a lot of other people seemed to find them, but it’s funny looking back at how much WB was apparently convinced Miller was a breakout star. They fought to keep Miller on as the Flash back when their contract was set to expire in 2019, told the CW to include them for a brief crossover with Grant Gustin, and had them play multiple characters in this movie.
When all is said and done, Grant Gustin is the Flash people are more likely to remember fondly.