B112, including a Cannot Parry add-on
P103 added Destructive Parry and Dual and ST-Based enhancements which mitigate the value of the limitation and can turn it into a net enhancement. It also clarifies an aspect about how it operates:
- Melee Attack turns an attack advantage into a powered melee weapon, not a ST-based one; damage isn’t cumulative with thrust or swing damage. It lets the user wield his attack in one hand.
touch abilities like Leech and Neutralize count as this according to Powers.
GURPS Power-Ups 4 pg 4 "Aura of Power" gives example of Affliction enhanced with Area Effect having the Melee Attack limitation.