i like the blast assault its deadly when paired with the shot gun, massive aoe expose that hits as high as 600 - 800 when fully buffed, and a primary attack that hit almost as hard as a pulse rifle, combined with knock down. you can quickly run in and tear things up with a shot gun using pounce or lunge as a closing mechanism.
Personally, I think the Shotgun is moderately OP. And I'm a Sci using it. Not to mention a Tac can not just 1 shot a single player, but probobly an entire team if he does it right. (I've seen it happen)
As far as Science officers, the Borg Analyser kit is quite nasty fully speced. Gives you that invincibility type healing + Tachyeon Harmonic to completely kill shields, and destroy Cover Shields.
I'm 100% Glad they buffed the Engi's Orbital Strike. I always hated how little damage it did.
Neural Neutralizer is no different from Jam Sensors in space combat. It takes a couple seconds to work, and doesn't take much to remove it. Useful as an escape ploy or a way to get rid of alot of focus fire really.