Some interesting posts above. Thanks to Leslie Butler for pointing out that Goffin wrote the Oh Neil lyrics. (Confirmed on the photo of the single on YouTube).
Neil also was a founder member of the Tokens who had a hit with The Lion Sleeps Tonight.
I actually agree with a lot of the points made above, the good, the bad and the ugly. Re Neil, yes he had a cheesy image and sounds sugary however, he did have a great knack for writing good pop songs of the two eras when he peaked. IMO, the bridge in Breaking Up Is Hard To Do is a perfect example of Neil at his (pop) song-writing best.
Re. Carole, she and Gerry composed propably several of my all-time favourite pop songs. I think it's a shame she didn't acknowledge Neil in her bio however, it's her book and she can say what she wants in it nevertheless, It would be a bit of an oversight for any independent biographer writing her story to miss out Neil's involvement.