I have mixed feelings about it now. I think it held me back as an artist when I could have been spending those years learning my own style, but then again, it taught me how to stylize, and eventually I did find my own style.
LOL I basically just said the same thing somewhere else. Supernatural helped me find my style, though it was hard because I was so influenced by manga artists during the first several years of drawing...and yes it's a work in progress because we're still learning, and that's good :)
I talked with Amber earlier that I wanted to set up a art community where we can experiment with styles, throw out prompts and fill them, and just have fun, low pressure, weekly theme from small ones like drawing Dean's lips or Sam's hands to more ambitious ones which we haven't got to it yet... but then I got papers and trips, and it seems unlikely that I could do it. But it's a thing to keep people drawing and practice, I think :)