Having listened to the first 25 minutes and last 25 minutes of the podacast, I'll offer some suggestions:
Firstly, I think I can explain faults in some of the criticisms of utilitarianism:
> Wes suggested that utilitarianism will result in 51% of the population oppressing 49% of the population. With "misery" for the few and "contentment" for the many. Well, firstly, if the few were miserable whereas the many were merely content the greater intensity of the minority group's feelings would cause their interests to prevail. Furthermore, the utilitarian approach would be to cultivate values of cooperation and community over any long-term division of society.
> utilitarians conclude that taking people's houses at a whim and, say, turning them into playgrounds is a bad idea. It would cause anxiety among the wider population. It would create a playground that noone would want to use. Of course, the government who made the decision would be unelectable! Few utilitarians oppose the idea of property. It helps to incentivise work, run our economy, and help to get things done.
> on the idea that it is hard to justify utilitarianism using premises which are outside of our culture, I would suggest that the criticism is misplaced: it hits other ethical systems harder than utilitarianism. Consider the origin of the following values: purity (of religious origins), fairness (from reciprocity), loyalty (of tribal origins), etc. Although I'm no historian, these values seem easy enough to pin down, especially compared with the value of happiness.