Since the BF charts have not been published yet, we only have this current era of crowns to review for now. For all intents and purposes, I will ignore honour and split-wins because neither are true crowns. It goes without saying that that honour is a silly prize and split wins are not crowns by definition, since crown requires winning BOTH land/nw*.
So without further ado, lets look at the most worthless crowns since Age 30 so we can separate the pretenders from the true powerhouses of this era.
1. Warcry (Age 42) - Peaceful dicing by virtue of neutrality in an awar age. Any win is essentially stupid and silly based on that fact. Furthermore, they only secured the crown after Sleepy breaks nap with Seasons who were poised to outpump them in nw.
2. Pantheon (Age 36) - Peaceful dicing during the age of pre-nerfed dice with overpowered BE dwarfs. Trixsey tricks Brute Force into a pre-age unconditional nap, essentially contracting Brute to be their blocking *****. They eventually become Trinity, which is present day Fury; enough said.
3. Hall of Heroes (Age 51) - Peaceful dicing by virtue of absalom favours. It is an anomaly that weak kingdoms get this big and stay there, other than the two previous examples. It is the weakest win in the past 10 ages besides the split crowns in Age 43 (Sanc/Rage) and 48 (Pulse/OS).
To conclude, in any normal age, these three kingdoms would amount to nothing as their history and lineage would reveal.
*Sanctuary and Rage have won their own crown and deservedly so, which eliminates them from the fake winners list. The remaining split winners include Equilibrium, Pulse and OS who did not win in proper fashion.