as he sliced through wave and wave of droid battalions and Geonosian warriors
No single clone has fought hundred battalions of droids and those bug things on Geonosis, by implication from that scan Trebor has killed more than a single clone.
Trebor can redirect fire and move faster than a clone by using the force, Trebor takes this or dies trying
Well Battle Droids(least B1s/B2s though a little moreso the former) can't aim well and aren't that bright. So really no surprise that Coleman wouldn't be able to cleave through many droids, even if he was moreso a diplomat than a warrior.
Jango...is more than some battle droids with way better aiming, Trebor was only able to deflect all of 2 shots...here...he might not even be able to deflect any considering the wall of blaster fire coming at him.
Although Trebor was rather caught off guard by Jango, focusing his intent on Dooku. But even still.