I keep hearing that Shadow is weak in PVE questing...I don't buy it.
I leveled from 1-50 as Inf (2/31/8) I had to keep the douche canoe with me the whole time, but so what. I had no problems at all with any quest, save Attis Station (enjoy that one!!). No, I never came out of any group fight or elite fight with 100% health, most times I was around 30-45% health. While that my bother you, I don't know what to tell you other than that's the life of the Inf.