People write negatives things, cause they feel that's what sells. Good news to them, doesn't sell.
For me, something will come in my head and I'll either end up calling my cell phone to record it, or I'll just pick my guitar up and see what comes out. Sometimes it sucks, sometimes it doesn't. So there's really no set method behind it.
What I thought at the moment was the worst thing that could happen was absolutely the biggest gift I've received.