I finally get what people mean when they complain a hero or team is "over-powered" or "over-powerful."
This roster is certainly those things! The only upgrades I could see in terms of power/skill set would be to swap out Green Arrow for Shazam and to add Lex Luthor to the team. Then you'd have the world's 4 smartest people (instead of only 3) and Shazam is almost the only way to add even more power to this roster.
You've got three Kryptonians, a Martian who is essentially Kryptonian-plus wrt powers, the world's mightiest Amazon, the fastest man alive, the King of the Seven Seas, and the three smartest heroes in the DCU in Mr. Terrific, Batman, and the Atom. Plus Cyborg, upgraded immensely with his Fifth World/Mother Box tech. And, um, a really good archer.
If you were going for most powerful team of all time, I think you found it.
In this run, I would predict each issue would end with Green Arrow lecturing the others on ignoring earth-bound, street-level problems and quitting the team, much in the way Kenny used to die in every episode of South Park.
Do NOT tell Amazo!