Tier C:
Warriors, Paladins, Death Knights and Druids
Not real tanks - no engine or real firepower, although they can sustain a few hits so they get a mention at least
Tier B:
Salvaged Demolisher
Kinda a tank, kinda a catapult. Higher than Rank C because it actually has four wheels
Tier A:
Salvaged Siege Engine and Wintergrasp Siege Engine
These are tanks. They have four wheels, decent armour and decent firepower
Tier S:
Flame Leviathan
More than just a tank, this is the MOAT (Mother Of All Tanks - although I am unsure if this tank is really a mother or not).
This thing has enough firepower to destroy up to 25 smaller tanks in a single fight if the enemy team is unprepared.
Plus it has four wheels.
