there is zero credibility in those marvel/dc crossovers as they are simply marketing/moneymaking comics with no basis in comic book reality.
come on batman beat the hulk in one

fact is dc has 2 major stars - superman and batman.
marvel has loads - hulk, spiderman, wolverine, x-men, ironman, cap a, thor etc etc
dc had to win some fights

also can i point out doomsday was weaker than hulk ( unlimited strength), and has no enhanced healing, etc- if he killed superman - hulk would too.
i can fully accept hulk has limitations when dealing with magic ( can be teleported away, etc) but there is very very few who can beat him in a purely physical battle.
seems like you thor fan boys will grasp at any straws you can to try to discredit the strongest one there is........
heres one for you - i think hulks son skaar may even beat thor in a physical battle.
also still waiting on acceptance that herculese is stronger than thor.........