Slicing got hit to hard, it needed a nerf not a nuke. Slicing is a hacking gathering profession requiring you in effect to steal money. That's right your a thief. Having said this it still needed to be nerfed due to its insane rewards. However, at max level you should not be loosing money 75% of the time during your theft. Yes the missions should be adjusted to reflect the actually player being involved however. Bottom line in my opinion it was nuked because some one got really jumpy about its profits, which should have happened. Now tweek it back up and follow the policy of other mmo's that have done the same. You will find the balance.
To those freaking out, IT WILL GET FIXED. This is what happens in mmo's when a large imbalance is found. IT gets nerfed into the ground and slowly reworked. If BW follows this policy. If not it may be a big mistake for crafting in general. Vast majorities of players do not like "grinds" or useless skills with stupid low proc rates.