What was the design teams rationale in adding a second siege style unit (Thor) to the Terran race?
(www.starcraft2.com.au) The Thor’s role compared to the Siege Tank, is more of an assault unit rather than a siege unit. The Thor is much more exposed when attacking an enemy location, while the Siege Tank has a much larger range and is able to hit the enemy at a larger distance. The range of the Siege Tank has also been increased since the BlizzCon Demo.