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.
He's an amazing fighter, a tactical and strategic genius, his reflexes are uncanny, and he can take a lot of hits.
But Doom is way out of his league. He is a master of magic, science and technology. He was able to build a chair that analyzed and drained Silver Surfer of his cosmic powers. It's not the only time he's drained Surfer of his powers. He separated Hulk from Bruce Banner. He has grappled with Iron Man and an atlantean with strength that rivaled Namor's. He survived a hit from Thanos and a headbutt from Hulk. Captain Britain, a 90 tonner, barely made Doom feel a thing through his shields. His blasts have KOed the Hulk. He trained under Dr. Strange and learned things that the Sorcerer Supreme didn't.
Doom stomps.