I play on normal, as an adept, and while most biotic attacks are still inneffective against shielded enemies, thankfully the majority of the enemies don't have shields. If anything, I'm finding biotics to be overpowered. I can sit behind a crate, bending biotic attacks around obstacles, mostly using pull to slingshot enemies into walls, or raise them up in the air to make them easy targets for my allies, or a well timed warp (I've got pull upgraded to have a high area of effect so I launch whole groups into the air). Warp is also very effective on shielded enemies, one or two hits generally enough to knock out the shields on all but the most powerful enemies, and I've replaced my pistol with the "hand cannon", upgraded to do extra damage against armor, so once the shield is gone I mainly use my pistol to knock out their armor. Then fire off a pull for a more spectacular death.
I've also noticed that biotics seem to be extra effective against husks, anyone else noticed this? Was fighting a bunch yesterday, tried using warp, not very useful, it damaged them, but didn't quite finish them, and it only affects one target. Tried using my hand cannon, same thing. Then I used pull, and wow. For some reason it just ripped them in half, instant kill. There were a ton of husks in that fight, and I used a mix of pull, push, and singularity, along with my allies firing the occasional shot (with incendiary ammo of course), there were bits and pieces of husks flying all around the room, one particularly memorable moment, I ducked behind a wall to dodge a flaming husk torso that was flying towards me, it went splat against the wall behind me, then disintegrated into ash.