It's important to note that if you go for a full biotic build in ME3, you have to make sure to turn the subwoofer all the way to the max. If you don't have a subwoofer, you are playing it wrong.
The easy way is to use reave with the radius evolution. It is no projectile-power, staggers mobs, making it easy to hit with throw, warp, shockwave or even singularity to render them harmless as a followup. It also helps your survivability with a max of 40% damage reduction or cause serious damage to Armored targets.
No guns isn't a good a idea though as it breaks the game for an adept with its inability to strip shields. That acolyte pistol makes it way more fluid then using energy drain.
