There just is exponentially more money in the movie business than in the music business. As a result there are more people involved in the creative process.
But what you realise after you've been in the business for a while is that people develop opinions about you that don't have anything to do with your music, they like or dislike you for a million reasons, they like or dislike you for your last record.
For me, songwriting is something like breathing: I just do it. But that doesn't mean you're fantastic.