There's no right or wrong in C&C. You're just judging people based on their "reputation". Knowledge comes from everywhere. If you're going to ask for C&C, don't tell them "Oh, I've never heard of you. So, you must be wrong." with your actions. If you're going to do that. You can open up your sigs on your own computer and tell yourself that the lighting is good enough or this sig has nothing wrong with it.
Let me summarise. Don't ignore C&C's because you think they aren't right or worth your time. They're still people's opinions, which you asked for.