All of those are dos characters and are FAR weaker than current incarnation. I'm not impressed. DOS Doomsday would get merked by any one of the members on the opposing team.
Okay. On the flipside, as long as we're doing our best not to, you know, conveniently leave things out:
He didn't have a GL ring when he tore Mayhem limb from limb while Darkseid watched.
He didn't have a GL ring when he basically tossed Darkseid out on his ear, and Steppenwolf promised to keep his lips sealed about what he saw.
He didn't have a GL ring when he defeated the Guardians' champion, Zharan Pel. That's how he aqcuired the ring you mentioned. Then he killed hundreds of GLs, and wounded thousdands.
Wha? First time Im hearing all of those heroes were weaker versions. I mean, I know all comic characters power levels flux up and down, but they were basically the characters theyve always been there, so DOS Doomsday was Very Powerful judging by who he defeated and what it took to Finally take him down. Can he defeat Level 1 Kurse, not sure, but hes make it a damn close fight (hed lose to Level 2 Kurse, though dont think thats the version being used here)