Tigers are bad, but not the worst. We have dozens upon dozens of biting mosquito varieties here; it's crazy how small some of the species are, they'll be biting away at you while you are preoccupied swatting at their larger cousins. The worst, IMO, are the black salt marsh variety. They are maybe a little bigger than tigers, and more aggressive. Where a tiger will land on you and seemingly take a split second to decide it's found a good spot to bite you, the salt marsh suckers land by harpooning you. They go face-deep immediately and swarm you like yellowjackets.
Thankfully, they are primarily found in marshy areas (near the beach) around here. Two years ago some farmer several miles inland got the bright idea to irrigate his acreage with briny water, created an ideal breeding ground for them. It was the worst, all the youth athletic fields in the area were plagued by them that season. You either stayed in your car or put half a can of spray on you to watch your kids' practice. It took local officials several months to figure out where they were coming from, they finally found the cause and sprayed his farm from the sky.
I have my hesitations regarding tinkering with animal genes to suit our needs, but I'm all for these genetically altered mosquito releases. We'll never be rid of them around here, but I sure would love to get to a point where I'm not screaming like a lunatic, "shut the door!" when someone is all too casually entering/leaving the house this time of year.