Captain Atom and Martian Manhunter are great characters that can bring loads of offense but have to go with Supes and Captain Marvel. They are two of DC's strongest and powerful and it's hard to go against Supes especially with a powerful ally.
Eh. I think a non jobbing Martian Manhunter would walk all over CM what with his million different super powers. Depends on how well Atom can handle Supes.
I think both these guys written as nonjobbers would own the brutes. MM has a myriad of powers and senses that should net him a majority. C.Atom at his full potential unleashed should be a match for Superman Prime and an owner of any other version, seeing as how he can create universes. But his lesser popularity kills his showings and makes him a jobber.
I never understood how a guy who can create a universe can't defend himself against a speedblitz. That shouldn't even faze him.