I think some of the lyrics are very good, for example...
Well, knowing you,
You'd probably laugh and say
That we were worlds apart.
I think this is Paul acknowledging John's supposed rough exterior, then...
But as for me,
I still remember how it was before
And I am holding back the tears no more.
Uh, uh, uh,
I love you, uh.
Paul saying to John, we were best friends and I know how it was. Then in an unusual show of emotion for Paul, he is saying he is crying.
I think it is a good song that shows how Paul really felt about John. I think if it had of been the other way, John would have been proud to write a song like "Here Today" for Paul.