Order these characters by fighting skill
Let's keep it going.
For this, let's make it two distinct things to see how much of a discrepancy there is:
a). Imagine them all in an identical body that they've adapted to. So essentially, pure h2h prowess.
b). How skilled are they at fighting with the abilities/weapons/knowledge they have at their disposal in general.
Batman
Doctor Doom
Tony Stark[a]/Iron Man[b]
Orion
Spiderman
Wolverine
Wonder Woman