Maybe it's your attitude?
It looks like you're implying anyone who doesn't get it is 'not-so-smart'. Even if you're not saying that explicitly they can probably sense that attitude :-)
I myself also don't see how it's a Facebook killer. I don't care about social networking, don't spend tons of time there, barely mange to check out my 'feed' sometimes.
If all my friends go there, sure, I'll tag along, why not? But am I going to make an actual effort, make a profile and even try to get my friends to join (as there will probably be none) all because of it having a new way of grouping people? No way.
I'm not saying it's not going to workout, it might or might not. Nobody knows at this point.
Just understand that most people don't care about something being a little better if they don't see how it's game changing for them. And let's be honest, for most of us google+ won't change much at all, for me the experience would be very similar on both sites.
So if somebody comes telling you how google+ is so different the natural reaction is to dismiss that person.
And also keep in mind that for some people Circles are a feature they would not want to see.
