Black Adam was just a montage of The Rock flexing and looking stern. The plot was non-existent.

I had a problem with the initial premise of Black Adam being a villain. "Intergang" was an organized crime syndicate ruthlessly controlling the city/country. Innocent people were killed because the gang's greed. Note, zero help or support from outside the city/country by more powerful people. So Black Adam appears and starts killing Intergang...and THEN the "heroes" of the Justice Society show up because Black Adam is killing people (just gang member criminals). Where the hell were the Justice Society when Intergang was oppressing the civilians?

The whole movie, I just wanted to turn it off and do something better with my time

When I saw the heroes attacking Black Adam instead of Intergang, I did what you didn't. I turned the movie off about 25 minutes in and did something else. I was curious if I missed out on a better ending, and I appreciate you sharing your experience and letting me know I didn't.

Flash is for all intents and purposes a better movie but it just was not as marketable as Black Adam was. The timing was better as the DC iirc wasn’t announced to be rebooted yet, Snyder fans were excited by the announcement that Henry Cavill is back, and The Rock has a much larger fan base than a troubled Ezra Miller. The Flash has to truly be one of the top CMBs for it to have had a chance the more you look back at it.