I can't really speak for anything else...but Super Strength/Might.
It needs knockback.
I know people in CoH were always against knockback...but the lack of knockback from Super Strength was always the "downfall" of the set to me. It just never felt right. Footstomp was really the only power that had a true super strength feel to it.
I even slotted Knockback enhancements to get the correct feel of super strength.