'McCartney' is far and away my favourite Paul LP and, whisper it, the only one I kept on CD after a clear-out this summer. If it had been made by an unknown singer-songwriter on Harvest, Island or Dawn it would now be worth a small fortune.
Ironically, 'Maybe I'm Amazed', often the only thing said in its favour, doesn't really fit in with the general vibe of the other tracks.
I've always thought that it would have worked better as a stand-alone single, but then that probably would have irked the other Beatles even more as it would presumably have been competing with the 'Let It Be' 45!