Both Kurse and Thanos have beat the Hel out of Thor Jobberson but the Dark Elves beating was actually worse. Many people agree with the sentiment that Kurse is stronger with better striking, and also a great many argue against it. But the former is blatantly true.
Kurse inflicted more injury upon Thor than Thanos did. Yeah Thor has a bloodier lip from Thanos but thats literally all, and it just means Thor got hit on his lips more in that instance than against Kurse.
Thor was a bit woozy against Thanos but he was still able to recover and fight on to the point that he could resist all of Thanos' strength when he tried to impale him with Stormbreaker. Immediately after he's able to laugh at the sight of Cap holding Mjolnir as if eveything that happened beforehand was a joke too.
Thor against Kurse was completely powerless. There was nothing he could do but watch as Kurse went ham on him. Kurse was so much of a beast that he deflected a lightning charged Mjolnir like it was a fly.
In conclusion Kurse really is a bigger threat than Thanos. Look at how his strikes make the ground tremble. Bonus gifs of Kurse's Resume for the DCEU:
He's the black hole to Thor's star level durability