Covenant was a breeze after the first tower. Except when I had to fight the hunters. I kept throwing grenades and shooting, until I remembered...I still have my hamma!
In Cortana, I usually kill eveything before moving on. No wonder I'm having so much trouble.
About the wraith part, that's where I have the most trouble on The Covenant. I flipped over once, and my guy wouldn't get back in the turret. So I sat there, and when he finally got back in, a flash of blue came across my screen.