I've read all the Doomsday stuff, I know he's a tough nut to crack. The villains our guys have taken down aren't easy to beat either, guys like Talbot, Cassius, and Victorious.
Besides I think the key would be Jason. He can absorb energy, anything DD does to him Jason can just absorb it and makes himself stronger. In a long grueling battle Jason plus the team will bring Doomsday down.