Spector isnt as good as the top tier MA's. Hes slightly above Punisher in that aspect.
In the story where Spidey almost drowned DD, DD was daydreaming before getting himself free. Also note, he took a hit or two from Spidey during that fight.
As far as Fury, Gobby and Spidey being able to unarm MK, is unfair to say that DD would have a difficult time as well. His means by going about it would be totally different from those 3. On paper, DD doesnt have reflexes like Spidey, but on panel, Spidey ALWAYS has a hard time hitting DD.
As far as Fury goes, I know hes among the top MA's, but hes no DD.
MK does have a nice arsenal, but him hitting DD with one of his projectiles is highly unlikely. They did scuffle before and i had the comic. Im trying to get it now. They did stalemate hoewever. Having an adamantium staff wouldnt be as useful/helpful as having the adamantium armor.
With all that said, he still loses to DD for the majority.