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.
Yes its Mighty Thor the only God in the battle but he is alone versus nine characters at once.
A couple of them is no threat and may not hurt Thor but its still at least six or seven opponents capable of injure him.
Being a warrior God Perhaps he could take out a couple of the Dc heroes before become knocked out or sent to Valhall.
In a one on one battle Thor would defeat them all, Martian Manhunter would probably be the hardest opponent.
The Alien got an incredible versatility and got no weakness or limitation that most likely would be exploited.
But also Wonder Woman, Green Lantern, Flash and Superman may put up a strong fight.
Black cannary and Batman is no threat and could even be ignored, there is no honor in killing mortals.
But this is not a one on one battle and team Batman will of course win.