"The Flash" has received mixed reviews from critics and audiences. Many praise its ambitious storytelling, special effects, and the performance of Ezra Miller as the titular character. The film explores themes of time travel and alternate realities, featuring appearances from iconic characters, which fans appreciate. However, some criticism centers on its pacing and plot coherence. Overall, whether it's considered good or bad largely depends on personal expectations and attachment to the DC Universe.

"The Flash" movie faced several challenges contributing to its underperformance. These included negative publicity surrounding lead actor Ezra Miller's legal issues and controversies, which impacted audience perception. Additionally, the film's marketing was inconsistent, and it struggled to establish a clear identity within the crowded superhero genre and a shifting DC Extended Universe. Competing releases and a lack of strong critical reviews further diminished its box office appeal, leading to its overall disappointing performance.

As of my last update, "The Flash" faced significant challenges at the box office, leading to mixed reviews and lower-than-expected ticket sales. Despite high expectations due to its connection to the DC Extended Universe and the return of popular characters, it struggled to attract audiences and was considered a financial disappointment. Factors contributing to this included competition from other films and controversies surrounding its lead actor. Overall, it is generally viewed as a flop in terms of box office performance.

In "The Flash," Batman, portrayed by Michael Keaton, changes because he is a mentor figure to Barry Allen (The Flash) as he navigates the complexities of time travel and its consequences. Batman's experiences inform his guidance, highlighting themes of loss, responsibility, and the impact of one’s choices. The character's evolution from a solitary hero to a supportive ally emphasizes the importance of teamwork and understanding, crucial for Barry as he learns to harness his powers and confront challenges in his quest to change the past.