Two of those statements fail the test of truth... The other fails to support your case even if true:
Most played, certainly not, I would imagine that a song such as, well, Imagine, would shade it, as would Candle in the Wind, by a mile - and that is based on sales, requests etc... Candle is the only single ever released by a single artist in three successful versions;
Best accepted? Who by?
Cult... Yes, but that does not make it the 'most' anything, there are a number of cult songs... Including Candle in the Wind after it was (unfortunately) re-worked to go with the whole Princess Diana business...
For a test of greatness, you need something objective and demonstrable.