But was that really Doomsday? I mean that was WAAAAAAY too easy.
I think that the episode was actually taking a shot at Doomsday's character by having the alternate universe Superman beat him without too much trouble. This belief is further backed up by a "Death of Superman" episode that DIDN'T involve Doomsday that happened soon afterwards. I feel this was done so future writers could not have Doomsday kill Superman later on (because the "Death" storyline had already taken place).
Personally, I don't mind this since I'm not a fan of Doomsday.