I think the main issue here is that they reinforce the complete lack of Separatist Synergy, and they don't help give the Sep faction a theme.
Think about it, Resistance have Exposes, Jedi have buffs upon buffs upon buffs, Clones have 10,000,000 attacks every battle, Empire has debuffs for your debuffs' debuffs, Separatists have... nothing. Pretty much the only thing that multiple Seps have in common is the inability to be countered, on Dooku and Grievous.
If Grievous is going to be reworked, he should be as the primary rework of a Separatist faction pass and, as such, he should have a theme to his character that the rest of the Seps share.
