Still wouldn't be that useful if their stats suck so much they die really quickly. Might as well just produce an army of zerglings or roaches in the amount of time it takes you to sit in your base with your infesters and summon infested terrans one by one.
I think Infested Terrans make the most sense as a sudden burst of support / cannon fodder for your army. You're in the midst of the battle (or right before it) and the 3 or 4 infesters you have at the back of your army spit out a group of infested terrans who immediately jump into battle and are either killed within 10 seconds or die after 20-25 seconds.
It should be possible to produce a significant group of them quickly, and they should be strong enough to have a measurable impact on a battle without being a main source of damage or difficult to kill individually. Kind of like skeletal warriors raised by Necromancers in WC3. That's how I envision it, anyway.





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