Of course not. It is nice to hear some compliments, but I'm fully aware of the flaws of my capture and processing. This is a never ending road. There is always room for improvements, and much more to learn. I'm very happy to have reached a point where my works generate such reactions in the viewer (calling it "art" really touched me, because this is how I see this... and I aspire to create new forms of art), and this is also involves a new challenge to me: both to keep/improve the current level of development of this work, and also to look for new things to try.
Also, critics are always highly welcome, since they make us learn from our mistakes. But, sometimes, critics are arise when people is faced with new/different things. That's why I asked what Kolec meant by a nice background. Paradigms shape our perception of beauty. If we see something new, it may shock us at first, and most probably we'll dislike it. Takes time to assimilate those new ways to interpret the universe. For example, many years ago people were accustomed to see white, flat, saturated stars... now this has changed, and colourful, gaussian shaped stars are perceived as nicer. Something similar happened with noise reduction techniques. Some people like to see some noise in there, because they believe that it yields a more natural look. For others, noise is just a degradation of the image, and has to be completely removed (but not at the expense of real structures). You may call that different "schools" of image processing. Even geographically "divided", people in Europe tend to saturate less the colours than those in the USA.
So, the bottom line... critics are always welcome, but I also have to weight them against what is "my" paradigm of astrophotography, or to what is my intention as an artist to show with the data.