I can't really make my mind up about Biotic/Tech skills in general tbh. It seems against general fodder, that is, the weak enemies without Shields or Armour that tend to attack in packs, skills like Incinerate, Cryo Blast, Overload, Pull, Throw, etc, and obviously the Unstable Warp has a massive explosion radius but requires 2 Biotics to use it, are all useful for taking them out, but then again, what isn't? Almost all the skills are rendered useless when an enemy with massive shielding or armour comes to play which is where you tend to actually need them.
It seems that Soldier has gone from being terrible in ME1 to been far superior in ME2 imo. His skills just seem so much more useful in all situations and thanks to a full selection of guns you don't have to worry about ammo too much.