Calico Skies is a beauty of a tune, I agree.. Forgot that George didn't like that song, seems like a huge highlight off that album to me.
I feel like there's at least a few decent to good songs on most Mccartney albums. Off The Ground is slick and faceless but the title track is an extremely catchy and fun tune that I come back to once in awhile. Guess I can't really remember anything else except maybe "Golden Earth Girl". Seems like a generic piano ballad but has a really nice refrain i feel.
But yeah the stretch from Press To Play until Flaming Pie (not including it, I like that record pretty well too) is his weakest run ever most likely.