Im not sure what Blizzard was thinking when they made Siege Tanks (in Siege Mode) ridiculously, ridiculously overpowered. It's just bull****. Their range is so long that a skilled terran player will scan your base and destroy everything you have with only a handful of siege tanks sitting outside the range of your bunkers, photon cannons, and spine crawlers - so all those minerals you spent on defense are wasted until Blizzard finally nerfs the siege tanks in a patch. And dont bother attacking them, their damage and AOE are already very powerful, and combined the longest range in the game, your screwed. Vice versa, with a couple of anti-air towers, a terran with siege tanks guarding the rims of his base will not be penetrable. Their powerful range and damage would be tolerable if their range was not the longer than defenses (bunkers, photon cannons, and spine crawlers). That is the solution - NERF the range.