Well,
The truth is that in most cases I always have many things to say, both positive and negative. From my experience I learned that it is better to save as much negativity as possible and give advice on how thing could get better.
Turning to composing skills, well, music composing is a process that depends on one's feelings so a composer would get very upset if you tell that him/her that his/her song doesn't worth a penny. Fortunately, I haven't come across such poor song in SZ.

I know I'll be crusified when you hear me sing.

King regards,
George V