League-of-legends – the spawn frequency of the tank minions in League of Legends

Okay, from my experiments, it goes:

Armor/MR reductions <--> Percentage Reductions
(They stack multiplicatively, so order is irrelevant)

Flat Reductions

This makes sense, since if flat reduction was the first thing applied, after armor, it may have failed to provide a benefit at all (since, for instance, the difference between 50 * 27% and 48 * 27% is minute at best. 50 and 27% being the base attack damage of Ezreal and the armor of Amumu, my two test characters.)

Shields act as health, and damage done to shields is likewise reduced by armor / magic resist. (Meaning shields on tanks can generally absorb more punishment than shields on squishies)

1100-1400 ELO is a point where players aren't too familiar with the more difficult concepts of the game yet.

If Amumu isn't banned, who is going to kill him? In a coordinated and balanced teamfight, it's highly unlikely anyone but the ranged AD is able to effectively stop him. (Tanks are usually banned because they are harder to kill.) Many players may not know how to position themselves, or to stay alive so these hard to kill champions may be considered overpowered at this ELO.

Who wants to chase Singed through a mile of poison gas? Who wants to be hit into the air by a scary piece of rock? A lack of competency is most likely present at this ELO so therefore certain champions are able to take advantage of this and contribute more to the team.

At professional levels, more strategy definitely occurs during champion selection, but at this specific ELO which most of LoL's ranked players are in, these bans occur often due to the reasons above.