WH40K Ork Boyz

[Onkl]

Hi guys

Could you please help me with a question regarding Warhammer 40k?

I'm trying to get an evaluation of the "combat strength" of an Ork Boy. My average "Line Infantry Space Marine" from your average chapter will have around 500 CP - since I have never played the tabletop all my experience comes from computer games. In those, the Battle Brothers usually slaughter masses of Ork Boyz, so should I consider them to be "fodder"?

How is that handled in the tabletop game?
Does an average Ork Boy have the ability to injure a Space Marine (or will his armor be too much to overcome?)?

I will use the "Fodder", "Worthy", "Boss" graduation to classify the opposition, wherein Fodder will be die a gruesome death should they receive 1 point of injury, Worthy will die when reaching 0 HP and Bosses fight with standard GURPS injury rules.

I've created this chart, but I think I made an average Ork too powerful?