I still can't stand the laser/jdam guided SPG crap. There is no way in hell that a cannon round should be able to follow a random pattern of driving around. Not to mention the size of the maps allow most of the higher level SPGs to cover the entire map; except where the terrain hinders that shot.
I was on a map the other day with 4 SPGs on my teams side and about 5 seconds after the start of the round they all shot into the enemy start point and killed 6 tanks at once. No one had spotted anything at all so POSSIBLY they had a "C" word enabled...or maybe they just knew the layout really well with a highly trained set of crews.