I see Hulk dominating in the battle threads in contests of raw strength but I don't think I ever see any mention of his vulnerability to love. You can call it plot induced stupidity if you want but the Hulk has consistently been beaten by this power within the continuity I'm familiar with. Most of the time I've seen his rampages stop dead in their tracks involve Betty Ross intervening or at least imagery of her. The most recent example being Hulk vs Dracula during Fear Itself. Can't it be said that the Hulk would lose to love in any given context of a fight? If we stop throwing him into bloodlusted deathmatches we'd realize that he's as much a big softy on the inside as he is a gamma powered monster on the outside.

If we're factoring reality then virtually nothing can be defeated by the power of love.

But he fights betty now so its not the same anymore