Wasps and estate agents: what are they for, actually?
http://insects.about.com/od/antsbeeswasps/f/What-Good-Are-Wasps.htm
snippet:
Speaking in very general terms, wasps do a lot of good, actually. The term "wasp" is used to describe thousands of species within the order Hymenoptera. These include: the parasitic wasps, like ichneumonids and braconids; hunting wasps, like mud daubers, digger wasps, and spiders wasps; and pollinators like the fig wasps. As a group, wasps provide extraordinarily important ecological services, including pollination, predation, and parasitism. Put simply, without wasps we would be overrun with insect pests, and we would have no Fig Newtons.
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Actually, they are much the same - we complain when they sting us but ignore the valuable things they do.