| posts: 1,095 | Location: Austria
I've played the first two campaigns on hard. The defense turrets are too strong. When I place 40 point defenses behind two shields they can easily stop the simultaneous attack of 3 galactic colossuses without even taking a slight scratch!
My idea would be that shield generators start with 0 energy at build time, and must first charge up. It would make more sense than building one, voilá you have a new generator pre-charged with 10k points of strength.
Overall SC2 is quite fun despite it's lack of complexity.