Morlun definitely has feats that suggest he's capable of hanging with WW. The problem is, he has no showings against class 100+ characters. Random speed/durability feats alone arent enough to speculate that he can beat someone that strong. That said, I dont see WW walk through 2 hundred vibranium missiles like they're nothing.
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He was said or claimed to be able to hang with Thor not sure when or where that was said and I'm not saying he could because character statements are most o the time kinda meh. One thing's for sure, he has become way more than just a Spider-Man villain.
And 2 of 3 times he was defeated via plot device (absorbing radioactive blood) or BFR (his soul in exchange for T'challas into the death realm) I can't remember what happened the third time (Spider-mans 2nd encounter with him)