I did jury service a couple of years ago in the UK - obviously a different system to the US. I came away feeling although in many ways a jury is a terrible way of deciding verdicts, that it is probably better than any of way of making a decision - in the same way that democracy can be considered the worst form of government apart from all the others that have been tried. Our jury did feel like a good cross-section of people (even if many of them had flawed ideas of logic) and that the value of the jury lay in the collective decision-making not in a simple aggregation of the individual decisions.