This spots are not very fair, and allow camping. Especially people with high ping. They should be fixed.
Now, I know every map will have camping spots, but I think these are the major ones.
Aslang-fightforthebase
http://prntscr.com/g2ag8u - Camping spot in the middle small fort
http://prntscr.com/g2agsl - Camping spot at the invisible door
http://prntscr.com/g2ah6n - Camping at the invisible door #2
http://prntscr.com/g2ahkp - camping at the top of the tower
Max teabag-arena
http://prntscr.com/g2aila
The walls in the map are basically all 2-3 units long, which means they are easily penetrated. Worse yet, there are a lot of open, long areas that are good for spamming.