There are many problems with Shadow atm but insanity generation is one major problem I am experiencing, especially for Voidweaver Hero talent.
VoidWeaver is currently tied with Dark Ascension due to its design (which is an odd decision by developers,but whatever), and its insanity generation during and outside of cooldown is abominably low comparing with Achon which favours Voidform and enhanced halo.
Shadow needs a buff to its insanity generation in general, or simply, revert the nerf to insanity generation made during DF because of the set bonuses at the time.
Number tuning only gives people an illusion, we need meaningful changes and fixes.