@bolshieIt probably does need a nerf, I'm hoping for a delay on how long it takes to reburrow personally, but we also have to see how it does being delayed along with all other temple units.
In the meantime the best counter to it is to be watchful, move units out of the way, and kill it from the air or with cyborgs/zone troopers/titans/things with more than one range, its biggest weakness right now is that it has basically no line of sight while burrowed and thus can be easily ambushed if their controller doesn't use them cautiously.