EVERY songwriter writes a certain amount of stuff which belongs in the wastepaper bin,

As Theodore Sturgeon said "nine tenths of everything is crud"
so nine tenths of the residue is not as good as that really spiffing 1%. But ask ten people which song fits which category and you certainly won't get anywhere near 90% agreement.

Songs need the right environment to succeed, but that would be a discussion for "performance". Still when you are first launching your magnum opus it is all too easy to forget that. First performance is taking priority. Newness and all that.