Yes they are extremely bad. I'm literally waiting for my lease to be up so I can move out of the area. I have at least one in every single night and they bite me while I'm asleep and wake up with bites on my arms and face!
Harrisdale is reclaimed swamp, and after the wet spring there has been an influx of mosquito's. That said it's a matter of perspective; I go walking regularly around dusk and haven't been bitten. Yet I've seen plenty of mosquito's around outside.
On the positives, the water has brought ducks and water-birds into the area which is always nice.