That's not true. In the grand scheme of things, yes, a good song is ideal. If you're totally solo and your mixes suck, you better hope your song is good enough to get past the sucky mix. But is this home producing? Home recording? Home songwriting? Home mixing? It's all of the above for some people. It depends on what hat or combination of hats you're wearing. I record other people somewhat regularly. I don't make a "job" out of it, but I got jobs to do if I want them. I couldn't care less about their shitty songs. My paid job is to record their shitty song well and give them a tangible product that they can sell, give away, whatever. It's not up to me to determine if their song is good or not. Even if they ask, I usually plead the fifth. It's the same with most guys I know that record other people. When you're paid to capture someone's thing, then that's what you do. We don't go around worrying if these people's songs are good or not.