What makes you think Darkseid can't beat Doomsday? He essentially HAD him beaten with a single blast. He had enough time to stroll over to DD's body, make a speech, heat some rubble until it was molten as a tomb, and walk away. Doomsday didn't get up until after the molten rubble had fully solidified -- a process that logically takes at least a minute. Looks to me like a single Darkseid force blast that wasn't even point blank range incapacitated DD for over a minute:
http://img393.imageshack.us/my.php?image=fbdd33c9jpgorig3ii.jpg
http://img393.imageshack.us/my.php?image=fbdd33c6jpgorig7jh.jpg
http://img393.imageshack.us/my.php?image=fb9b1381jpgorig5nq.jpg
http://img393.imageshack.us/img393/8751/fb9b1381jpgorig5nq.th.jpg
http://img451.imageshack.us/my.php?image=rubble3ib.jpg
The last three scans are panels seperated, just to showcase my point regarding how long he was down. Anywho, DD likewise took him out with a sneak attack.
All that really proves is that if DD has an opening and surprise, he can take out someone of Darkseid's durability. Something that I never questioned. OTOH, it also shows one Darkseid blast can incapacitate Doomsday. In a real fight, if DS can incapacitate him with a single good blast from afar, how would Doomsday even make it to him to land an attack?
Anyhow, the avatar retcon:
http://img442.imageshack.us/my.php?image=f9cca559jpgorig2ra.jpg