I have to say, I think you're being a bit harsh. While no test of human thought, based on a mere 60 or so questions, can ever do justice to what we're really about, I think it's possible to establish some markers of where we stand.
I say this especially since most members here are American, where you get exactly 2 choices (Republican or Democrat) to work out all the nuances of political and social thought. At least in Canada, where I live, 5 parties (and sometimes more) can contribute meaningfully to the political debate -- and in minority government situations, as we have in Canada right now, other, minority parties can have an actual voice -- that's a good thing, in my view.
And to be fair, the Compass doesn't pretend to measure everything, and yet I think it's also true that some of your concerns (like "tradition") are actually included in part because there strong adherence to values of the past, in whatever sphere of life, tend to be reflected by shifts either to the right or up on the scales of the Compass, while flexibility in viewing how others may organize their politics and their social personas tend more towards the left or downwards.
So, while certainly not perfect, and not a huge predictor of who you'd vote for if presented with types you've not seen before (like in pre-war Germany or Italy), I think the Compass can help people organize their thoughts a little more easily.
Life's complicated, and sometimes, a little oversimplification can help us sort things out.
