okay i'll go first


overated:
sac stone
symbol of rage
ring of sorcery

underated:
insanitarius
hellflower
geometer's bane
WARD!!!!!!!


in no particular order

underated:
courier
tablet of command

tablet is underated yeah, can do a lot of fun stuffs with it =P

Agree, and I would like to add:

Whispering Helm ( for ancient stack pulling)
Power Supply ( really situational item for early lane phase)
Nome’s Wisdom
Puzzlebox
Harkon’s Blade

Underrated:
Courier
Wards
Dust

I wouldn't call an item being banned from some games, underrated.

I wouldn't call those underrated. Noobs just don't know how to use them.

People refuse to buy them a LOT. When wards and courier should be bought every game.

underrated

void talisman

Fuckin' this!
So, SO useful.