The first graph I saw was that a poll of Clojure fans shows they like the language features in it. This of course fails to survey the people not using it and why not, and what undesired features prevent them from using it or what lack of features prevent them from using it.
I find getting people's input on things they don't use or participate in to be pretty useless. The people's lack of practical knowledge and prejudice just comes down to perceptions.
So people have a perception about X and don't use it because. A) To difficult B) To different C) doesn't meet a need D) Y is better then X for A B C reasons....
That's why it's always worthwhile to do some interviews to get the whys behind the behavior. It's always a risky business to go entirely by quantitative data and then speculate on the underlying motivation.
