Well that's just a non sequitur. It wasn't the Harley Quinn IP that was made into a videogame. It's the Suicide Squad as a whole, and the Justice League attendant with it. It's an ensemble piece, or at least that's the idea.
I know it's a useless exercise warning for the sake of nuance, but let's not become the boys who cried sweet baby. Yes, they're involved, yes they're shit. Take them out, and what so you get? Less androgynous Wonder Woman, Harley without and undercut and maybe white Deadshot? None of that would've changed the dumbass premise and the stupid design decisions, or the decision that Hill and Walker made to do Suicide Squad in the first place.