Thor fought him evenly without his hammer. Yet subsequently he has used his hammer and done no better. Doesn't make any sense does it?
I think one day a writer got lazy or a an artist and that they showed hulk taking hits from it numerous time, when we've seen Mjolnir trash the hulk much more times! I've seen him cry out in pain from being Struck with it! I miss the days when Artist would Show that Hulk was afraid of Mjolnir and Thor would even forsake using it. ERIK LARSON had Mjolnir hurt Hulk but he had Thor state that he would use mjolnir and all the power at his desposal, which was uncharacteristic of Thor! imo! STAN LEE wrote Mjolnir being too much for Hulk, PETER DAVID ignored it once, I think Thor is more than a match for Hulk without Mjolnir but sooner or later if Thor dont put him down he is gonna have to use Mjolnir, but I think Thor is more than capable of taking him down before but just unlikely. Thats my too sense