This film would be a big blockbuster and could beat crap endgames record if only

Let's see, Leto's Joker and Affleck's Batman were in Suicide Squad along with Harley Quinn and that movie didn't come close to making Endgame money. Also, people thought that movie sucked, which is why it's getting an overhaul with a different director and a mostly different cast.

"Riiiiiiiight." - Dr. Evil

And if it had a different writer and director. This movie was dreck.