Read a few posts and just decided to not go any further. I'll try to clear up a few misconceptions.
IMO she gains dominance as the difficulty increases and pull gains more utility. Pull/Acolyte can completely neutralize troublesome enemies like Phantoms, Hunters, Possessed Captains, etc that are a real PITA and deplete the wave budget quickly. You can literally play pretty aggressively with the Acolyte/Pull/Reave and hunt down these enemies depleting the budget and saving your team a ton of frustration. On gold and below assuming any kind of decent weight load out the time to set up the pull/reave combo is too much IMHO if you're with a decent team.
Also on Platinum more bulky enemies make the bubble more effective. It has a shitton of force upon deployment as well so it will stun pretty much everything even Atlases on deployment. I find Geth Scanner to be required equipment to get the most out of her powers. It also has DR for your team even if you don't spec into defensive bubble, which is nice for hacks, disables, etc.
Maybe I shouldn't say this but she is the easiest kit for me to solo Platinum with, she literally has an answer for every enemy type and can dispatch them quickly.