Martin did produce a few of Paul's solo albums, and he did produce Paul's theme to "Live and Let Die."
Paul's early '80s albums, which were pretty awful, imo. But it wasn't Martin's fault. Just bad songs. My favorite McCartney album is Band on the Run ('73). And yep, the song "Live and Let Die" was a very good one.
My first concert-going experience was McCartney and Wings and the L.A. Forum in '76. That was the "Wings Over America" tour. Jimmy McColloch and Denny Laine on guitars.
Agree -- the Beatles broke up at just the right time. They went out on a very high note -- Abbey Road.