I am not sure exactly what a mosquito's purpose in the ecosystem is...
Do they pollinate plants? Do they absorb CO2? Do they reflect harmful UV rays?
For whatever reason they exist, I still strongly dislike mosquitoes. I would venture to say that I hate them. Back in the A to the K, you can see a mosquito coming from a mile away (they are quite large). In the A to the Z, I am not even sure I know what a mosquito looks like, but I know they exist.
During my last visit to Mosquito-Land, aka Göyçay, I was bitten 38 times. 38 #*%$ times!