The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
But I'm assuming we're counting Expanded Universe, which is why Luke's stats are so high, Grandmaster Luke makes Palpatine look like a youngling in comparison, I mean his force blasts hurt Abeloth who is a cosmic being capable of casually consuming entire planets, maybe even solar systems as Luke himself stated she could and I quote "literally reshape the galaxy in any manner she wished"
So, I dunno, seems to me like Luke, if we count Legends, does have a massive advantage here.
The prequel hate is actually very rare and mostly unjustified. Unfortunately its just a small minority of fans pretending they represent the majority when they don't.
Prequel merchandise sells massively. The Clone Wars is the biggest thing apart from the movies themselves. Any time the prequels are referenced, people love it (e.g. Mandalorian). Its the sequels that deserve the hate not the prequels.