So many people out there have misconceptions on what a tank is.

A tank isn't a champ who just stacks resistances and health... Stop doing that it's stupid.

A tank is generally a bulky champ who has disables and can generally initiate.

Stats good on tanks (excluding resistances):
CDR (eg: frozen heart)
Auras (eg: aegis)
CC / Disable actives (eg: randuins)

STOP STACKING HEALTH FOR NO REASON.