Lol, oh man, Asari Adept can be a bit squishy.....yeah, has to be otherwise she would be the number one unit for 99% of the players out there. I usually rock her every night on Gold, and have even taken her to Platinum successfully with a good team. I don't usually use ANY boosters for gold, some revives or Cobras but no boosters. I do use them on Platinum, the few times I have gone there, but I really don't think I have the guns for that level usually.
It is a fairly simple build I am using, Annilation lifts them primes them, then blow them up with Throw(6th with speed and combo bonuses) Lance is I think level 3, Barrier skill, is maxed and gives 15% shields back on Biotic kills, Main class skill sits at level 5. She runs with Disciple(Siphon) and a Carnfex(explosion one, brain fart can't remember name)heavy pistol. I am usually top 2 on almost all missions, unless I get a really really good team in the run. I generally play her like a vanguard running all the time, only hitting cover when I have too, and comboing the heck out of everything.
Yeah, you do have to be mindful of her shields, but honestly, if she was any stronger with them, she would just about be unstoppable. If you have a maxed Asari adept, and she is bad, then either you didn't spec her right, or you just don't understand(or are comfortable with) how to play her. True, she isn't for everyone, as many people wouldn't like the play with 90% power use and only 10% guns(use Disciple siphon to help top health when you get opportunity).