I've refrained from comment on many, many deck creation threads, because of my perception that the artists were not taking constructive critique in the spirit in which it was intended, in other words, in a productive manner. Every deck can be improved. Every. Single. One. And critique is different than criticism. If an artist asks for feedback, I have no interest whatsoever in telling them their work is crap. That's not helpful at all, and it would be a rare deck indeed that had NO positive aspects to it.
All of us can learn. All of us can grow. And speaking as an artist myself, I appreciate honest, constructive feedback. Sure it can sting if it comes out of left field. But I take it in, I look at the piece again, and usually I learn something. Whether I do anything about it is my choice. But as long as the reviewer offers constructive feedback, I always appreciate it.
Constructive feedback good. Destructive feedback bad.
But if an artist can't seem to take it, I'm not going to offer it.
Edited to add: Giving good, constructive, detailed critique can take A LOT of time. That's part of why I choose carefully whether to bother. If the artist isn't taking it well, why should I give of my time and energy?