First off the collumn you have to scan before you can start the transformers wont pop up the option to scan without a lot of jumping around right next to it.
Then the first ground turret would not come down at all after 6 attempts. We got it almost down to zero but at soon as the cover shields popped up even with a clear shot we did no damage and it healed back to full.
So we skipped it and went on to the second set of transformers. The high health of the turrets even on normal made it impossible to split up and cover the transformers from workers with both turrets firing at us. We almost got the shield down but by then only one person was left alive at the last transformer and workers got the first one down. That was the closest we got.
Cure ground normal feels too much like an elite mission. The turrets need to be fixed. They are far too tough even with 5 players laying into them and even then wont go down at all.