For example:

We have a Ultos amulet - he is empty, really. Reason to take this - doesnt drop set bonuses with flat dmg + conversion. Cool bonuses, but we talking about of set with 5 items = 5 slots closed (ye, logical), low building variation mobility, can’t change slots, there are more powerful options for parts of the set.
Same trouble:
Iskandra’s

Runebinder
Ok, there is have skill mod, but before here was a skill proc, and THIS is may become cool feature from 5-items amulet sets.
Solution - add some needful stats from every sets: Ultos - speed(!), OA\DA; Runebinder - speed, HP, OA; Iskandra - change skill mod on amulet or\and add proc.
