Steel_Wind, I have to commending you for trying to be cool and actually empathizing with the artist as a fellow human being. I do have a certain degree of disagreement with you, however. I must also point out the futility of shielding people who engage in creative work from criticism.
When I write, I want proofreaders who are, well... Critical. I want them to point out every tiny flaw that I may or may not have considered, rake the work over the coals, and make me realize where the work has come up short. There is a big difference between saying that a given piece of work is horrible and making a personal attack. "That which would give off light must endure burning," after all. I have no problem with the criticism, as long as it's of the artwork and not a high-school style personal attack.
On that topic, incidentally, I feel that it's a legitimate criticism of his work to lambaste him for trying to sell this stuff. People who want to sell a product should certainly be held accountable for the quality of that product. I won't presume to speak to the artist's motivations or personality since I don't know him personally, but I can damn sure recognize something that's worth paying for and something that is not.
One final issue... Artists in all media and across all spectra of talent level deal with criticism. Constantly. One of the marks of a true professional is to recognize legitimate criticism and when it's so much noise. That's not even to mention all the absolute crap that gets put out in the entertainment industry because of contractual obligations. People who would endeavor to make a living in a creative field know how to deal with criticism... Or they go get a day job somewhere and give up on the whole thing.
Just my two cents, for what it's worth.