LK is a top tier meta-human with GREAT Martial Art skill, trained since he was born practically, easily one of the best martial artists in fiction generally speaking considering who he's defeated and easily top 3 in the MKU period.
That's a very subjective and biased opinion (even if LK trained since he was a toddler, he's still not trained as long as Logan has).
Let's see if I've got this right, you're assuming 1) the MK verse houses among the best hand to handers in all of fiction and 2) as a result, LK being (in your opinion) top 3 in said realm holds a more prestigious martial hold than a top 3 martial master would at Marvel? And you're basing a lot of this on the hyperbole comment that states; "Goro was undefeated in Mortal Combat for 500 years" as though we're all suppose to "oh and aw"? Jeez, I'll flip through a recent Wolverine read where a far from 100% Logan (a portion of his martial training under Master Po had been lost, devoured by Dr. Rot's tampering) defeated an undead Mystic Kung Fu Martial Master called "Murderous Lion" who was likewise supposed to be "undefeated" throughout centuries of time. Using skill and all kinds of 'mystical' powers to take out Logan ... and yet Wolverine still fed him his teeth. And again, that's just one recent read. But just saying this "Murderous Lion" was undefeated, or such a great martial legend, is absolutely meaningless unless his conquests are fleshed out through feats. So Wolverine defeating him doesn't mean much at all as Murderous Lion's infamy remains hyperbole.
I call foul to your not so subtle, unproven and highly subjective, suggestions there. I've sifted through what's been said and shown of Goro herein and remain unimpressed - and for what it's worth, I played the crap out of the original Mortal Combat and while not an expert, am at least cursorily familiar with the lore and core material. I'm not saying he's a push over, or couldn't score a few wins as Wolverine can be KO'd and taken out. Just not for a majority win.
But at this point, I don't think this is the issue we disagree with most. I take exception to some of your blanket comments that you pawn off as 'fact' yet reek of highly subjective fan wankery or are flat out not true. Take this comment for example;
Wolverine is not considered top 3 in MU, not even close.
While I might shy away from seeing him top 3 in Marvel, I wouldn't completely discount the possibility. I do take exception to the "not even close" portion of your comment. If you know so much about the martial masters in Marvel and Wolverine's standing amongst them, where pray tell do you place him and who do you rate above him? Black Panther? Who he had pinned and at his mercy before BP was saved via distraction (read: plot)? Or maybe Iron Fist, who Wolverine got the better of in a sparring session in the pages of New Avengers? Perhaps Captain America, who Wolverine took down via aneurism / pressure point in Origins? The aforementioned Shang Chi who Logan walloped in two panels? Who's above Wolverine? Daredevil? Elektra? Please enlighten.