I am in no way saying I like Celtic.
I am in no way saying he was a particularly good fighter. He was an idiot.
I am saying that, intentions be damned, Wolf is not a good fighter. End of. If we saw Wolf head against an Alien which responded to being attacked like any living organism would, let alone an Alien, then yes, he may have been shown to be a good fighter.
But he wasn't.
We can argue intentions all day. We can argue what they were trying to show until Kingdom Come, and a little bit further.
Or, we can look at what is so clearly in the movie.
The Aliens aren't defending themselves. Wolf's fighting style is suicidal and in no way indicative of how anyone should go about a fight.
The Aliens in AvP did, for the most part, defend themselves. Celtic's fighting style, while leaving much to be desired, showed that he was actually in some sort of a fight and showed he had some level of competency above "Strike heroic pose".
No-one who actually watched AvPR and pays attention, who considers for a second what they're seeing, can reach the conclusion that Wolf was an elite hunter. He just isn't. It's like watching Alien Resurrection and concluding Vriess is an ace marathon runner.