Not only that, but for most of the viewing public, they saw The Flash only really one tone, in a God-awful Justice League movie where he was the 4th lead and annoying as hell.
To think all of a sudden, after 6 years, people not only would rush out to see a movie revolving around what was a bit character no one even really liked, but MULTIPLE versions of that annoying character was kinda assinine.
Spider-Man was perfect with the multiverse story because they brought 3 stars together, reprising roles that spanned three different generations. Spiderverse was amazing because they created a great character to center the story and then the multi-Spideys around him were awesome.
This movie had a Batman that was never beloved, another beloved Batman who was basically just used as a prop, they never shared the screen like the other examples… and Supergirl who never existed.
Just terrible decision making all the way around.