Why is Mana the worst resource? Rate resource system from best to worst
Why does riot knowingly make mages the worst class to play? lets take a look at each resource type
Resourceless

-These champions dont require ANY resource at all to perform their abilities, they are only gated by cooldowns, No downsides at all
Fury
-These champions dont use resources per se, but generate it by attacking or engaging constantly,gimmick varies from champion to champion,they are only gated when they cant engage anything without being in risk
Energy
-These champions dont have to worry alot about managing their resources, they are only gated when you mindlessly spam their abilities nonstop
Heal
-These champions use HP to cast their abilities,can be borderline suicidal at early game, isnt too much of a problem once you get lifesteal or will of the ancients
Mana
-These champions use Mana to cast their abilities, they are gated early game and can only start truly being useful once you get Mana regen items
Opinions?

Rumble's Heat is also arguably worse than mana in a couple scenarios, as it forces you to maintain above 50% heat for empowered abilities/actually accessing his kit's power, where you need to carefully manage it so it doesn't go to 100% and silence him at an inopportune time while also making sure it's above 50% so he's not just outclassed by a mana-user with his kit.