the thing is just TOO damn effective.
It's a GV. As such it has a top speed of about 25mph, an open turret, and it's stuck to the ground. If people can't find a way to avoid dieing to it either they are just too busy vulching to drop the vh and clean up the field, or flat out stupid.
The WW has two things it does well, protect other gv's from low level IL2 attacks, and swat down vulchtards in droves. There are very simple solutions to both these uses.
As far as the whole Wirblewind spawning under a furball whines all I can say is LMGDAO. No one (or at least very rarely) says "Hey look, there's a furball over our spawn I better get out there in a WW ASAP!". Lets take a logical look at why people end up getting whacked by WW's at a spawn.
1. Someone, or a group of someones decides to roll some armor into an enemy field(they either will take a WW with now out of foresight, or after losing a couple tanks to the IL2s).
2. People on the other side see this and decide to up IL2s and B25Hs to defend.
3. Aircraft from the aggressor country show up on site and say "Hey look, low, slow, easy meat IL2' and 25s" and down they dive.
4. Inevitably guys start upping in light fighters to get the enemy fighters that are trying to get the IL2s and 25s.
5. The guys in the fighters from #4 get whacked by a WW and then the waterworks start.
