Do you get faster xp when you farm in 10 waves over and over than farming in 7 waves over and over. Everything seemed completely normal and fine. Characters with ranks in can research to learn more about them. This is a general rule for KF2, Commandos also display the health bars above injured ZEDs, allowing them to prioritize the targets and know when a particularly dangerous ZED is on the ropes.
The Field Medic is the guardian angel that keeps your squad fighting long past when you should be on the ground bleeding. I truly enjoy the different classes and look forward to new content.