UC London and U East Anglia researchers studying wasps ave found that while people generally hate them, that hate is in large part due to ignorance about the benefits they bring.
Their recent study points out that wasps are effective pest controllers. There are 33,000 wasp species. Some are specialized in which aphids, caterpillars or other insects they hunt as food, and can be used as pest control for crops that have to deal with those specific insects. Other wasps hunt insects more generally and can be used for multi-crop farms.
They're also important pollinators, and some plant species are completely dependent on wasps for reproduction.
There is also some evidence, although not much as yet, about various values of wasps for making medicine and as a food source.
*Ryan E. Brock, Alessandro Cini, Seirian Sumner. Ecosystem services provided by aculeate wasps.