Well, from a human's perspective, you're just about right. Mosquitoes can spoil an otherwise pleasant summer evening by their persistant harassment of us in an effort to suck our blood. And in some parts of the world, mosquitoes can be dangerous because they can carry deadly diseases, like malaria. Male mosquitoes sip nectar from flowers and are completely uninterested in your bare skin. In fact, some species of plants, including an endangered orchid, depend on mosquitoes for their pollination.
Mosquitoes are also important to some animal species as food.
Frogs, lizards, birds and bats are all quite fond of mosquitoes for snacking. I've mainly used scatter-plots in the scientific reports that I've written. This is where you plot points of two sets of related data. Scatter plots lea d to easy statistical and error analysis. I have seen other graphs used though - bar graphs, pie charts, etc.