The problem is that pull is basicly a worthless skill. When you get to gold, most of the enemies have shields so pull does nothing. Even if they wern't affected, it woudl be nice if you could use it to set up biotic combo's. As it, it's an almost pointless skill on gold.
Honestly, that is pretty much the problem with alot of classes.
There seem to be 2 things to do with the bubble.
1)spec it out for defence
2)Spec it out offensivly and have it warp people who walk into it, which you can then hit with Reave.
Unfortunatly, the second one doesn't work all that well because you set up the bubble around you. It would be better if it was a projectile for that use. It's really difficult to use the bubble offensivly though due to how it's set up. And it has a duration, so you can't even just set it up in a chokepoint between waves.
She's better than the Drell adept (who is kinda worthless unless they have a teammate to combo with)
Defensivly, it's pretty great. 40% DR is no joke. If you have a Geth Engineer it's the prot-a-fort.

Depends a bit on the map though.