Attitude in the presentation is not to be underestimated. If you're obviously 100% behind your song then, no matter how dire or cloying the lyrics may be, the audience will put that in your favour. On the other hand, a meek "If it's alright by you" mumbling of hang-ups into the sound hole of the guitar so that only the front row can hear them will sporn the negative views and attitudes shown in quite a few of the postings in this thread.