What's "Natural"? What's "Good"?

I was talking to a few friends earlier today, and I mentioned how a group I know was absolutely sure that there was no internal, intrinsic, discernible logic to the ways and laws of God. Which explained why that group has such difficulty discussing the ways and laws of God with people outside the group.

Was wondering --

1. Do you think there is any logic to things that are natural?
2. Do you think that logic is positive, negative, or neutral?
3. How do you evaluate "good"?

Another question, similar to #3:

What's your basis for describing something as a "blessing"? What makes you classify it that way, and how sure are you usually?