To be honest, there isn't a whole lot about the anarchist subculture (or any subculture, for that matter) that I would consider "good." I suppose you could argue that it provides people with a social circle and with an opportunity to discuss ideas with folks who look at the world similarly to themselves, but this can be considered just as much a weakness as a strength. Whatever limited positive aspects that the anarchist subculture might have are more than offset by the insularity that you referred to.
Does this mean that folks such as yourself who are critical of "the Scene" can't still participate in it in order to mitigate its negative aspects? No. However, simply resigning oneself to it or inflating its positive aspects into more than what they are is a huge mistake in my estimation. With that said, while I have made a personal decision not to participate in the anarchist subculture in any way whatsoever, I get the fact that not everyone is ready or even inclined to do that. I'm not going to tell anyone that they should simply stop participating in the anarchist scene if that's what they really really want to do, but I would only encourage them to not get too comfortable in that scene or too complacent about its problems.
A critical engagement with the anarchist subculture, even if one chooses to participate in it, should never lose sight of the need to explore possibilities outside its confines - with a view toward eventually getting rid of it entirely. Even if other options for anarchists to interact and co-ordinate projects with one another aren't immediately available, a willingness to explore possibilities outside the anarchist subculture and to walk away from it if necessary is an absolute must. That may sound blunt to some people but I think it's something they need to hear.