I don't care if it's signed or not if it's "good" ... "good" being an entirely subjective qualifier based on my mood, environment, and prior experience.
If a band is "signed" or at least making plenty of cash, I feel better about copying their CD or downloading their album. If a band is still working hard to scrape by, I tend to buy the album (on a record if at all possible).
But there's a good amount of garbage in both the "signed" and "unsigned" sets. I listen to music that is "tuned in".