I have been entering Commander Precon decks into brackcheck to see the various power levels of all the precon decks Wizards has released. This website appears to use the basic rules of brackets and give a rating to your deck.

I have entered decks in the following format: YYYY - Deck name (precon) or YYYY - SET - Deck name (precon). I have made all of the decks public, so you can search (precon) and see all of my results. Currently I show up as Anonymous User, so you cannot search by user name, nor can I share a link will all of my decks listed.

All deck lists were taken from Moxfield
The Decks:

2011

Devour for Power B3
Political Puppets B2
Counter Punch B3
Mirror Mastery B4
Heavenly Inferno B2

2013

Nature of the Beast B4
Power Hungry B4
Mind Seize B2
Eternal Bargain B3
Evasive Maneuvers B2

2014

Guided by Nature B2
Built from Scratch B2
Sworn to Darkness B2
Peer Through Time B3
Forged in Stone B2

2015

Swell the Host B2
Wade into Battle B2
Plunder the Graves B3
Seize Control B2
Call the Spirits B2

2016

Invent Superiority B3
Breed Lethality B3
Stalwart Unity B3
Open Hostility B2
Entropic Uprising B2

2017

Arcane Wizardry B3
Draconic Domination B2
Feline Ferocity B4 Note: this is showing B4 because the site mislabeled Divine Reckoning as Mass Land Denial, the error has been reported.
Vampiric Bloodlust B3

2018

Adaptive Enchantment B2
Exquisite Invention B2
Nature’s Vengeance B2
Subjective Reality B3

2019

Faceless Menace B3
Merciless Rage B2
Mystic Intellect B4 Note: this is showing B4 because the site mislabeled Divine Reckoning as Mass Land Denial, the error has been reported.
Primal Genesis B2

2020

Ikoria

Arcane Maelstrom B3
Enhanced Evolution B3
Ruthless Regiment B3
Symbiotic Swarm B2
Timeless Wisdom B3

Zendikar Rising

Land’s Wrath B2
Sneak Attack B3

Commander Legends

Arm for Battle B2
Reap the Tides B2

I hopefully will add more tomorrow.