So subjective I can't believe I'm typing this. The music world is as populated with solo-Mac songs as it is with Beatle-Mac stuff:
Waterfalls
Put it there
Ebony & Ivory (song of the year 1981-ish)
Band on the Run
Mrs Vanderbilt
No more lonely nights
Live and Let Die, et cetera

And I believe the argument should be tempered with "I think these songs are crap/great/indifferent"