The Siege Tank of Starcraft 2, while balanced and pretty much always cost efficient, is not as iconic as the Tanks of Broodwar, first of all, their Siege Mode Art is still kind of unrefined "If you can please make an alternative siege mode art, please do it, the "rehauled one", never felt right for me, i mean in "Tank mode", it looks great but in siege mode it still looks weird". Aniway, now that you are going to be tweaking a lot of the units in sc2, please balance the tank like the good old days, where you could mass it, and could rain total destruction on enemy lines. Aka Redesign the unit.
Compensate in other parts and balance accordingly of course, sigh i just miss the good old days of hydralisk and dragoons melting, with like 30 siege tanks.
That was exciting in SC2, now you see normally like 6-8 tanks top