I think the biggest problem with the purple team map complaint is as follows... I play locked and free cam, and a dota veteran so don't bother with the self center viewing ****.
take mid for example
as purple you have an equal opportunity to push mid as blue, but the problem with this is that in order to be able to see the tower, you are pushing, incoming minion waves, and the opponent with a readying stun/slow/knockup you have to suffer a lot more back side viewing than you would with blue, this meaning you can't notice someone coming in from behind as easily. with blue and your camera centered (or close to centered) you can easily see the tower, the player, the oncoming creep waves, and easier awareness of a ganker coming from behind.
one of the more obvious solutions is make the camera more like warcraft 3's was, a bit more zoomed out, and more overhead oriented.
the camera angle is obviously like so \ which is sort of annoying when you're like so /.
more zooming would be nice, but I find that most of the time the current camera is tolerable as purple... except as bot.. I have so much trouble with bot as purple..