Robodogs are dumb, unfun square bullet sponges
Seriously, they have to be one of the least fun enemies in any game I've played. It's a box on 4 legs that either snipes you from across the map, or runs around lobbing grenades or constant minigun spam. Why the heck would you think people wanted MORE varieties of them? It's not even the difficulty (I know they can be neutralized with an EMP pulse) they're just annoying and it's not even satisfying killing them. I avoid any activity where they show up like the plague (e.g. invaded/black tusk stuff).
I know it'll never happen but if they were removed from the game it would be a lot better. Just... delete them.