Relics are absolutely worthless on a high number of characters because they amplify useless numbers.

Well relics do affect more than just the 3 stats determined by their mastery. They also increase the base stat multipliers which means increases in health protection armor resistance, and physical critical chance for everyone outside of what their mastery hands out.

That being said, there are certainly some mastery bonuses that are wasted too. All in all, I think the year of KOTOR had lead this game into a state where defense was far too strong overall and the fact that attackers are the ones that benefited the most is exactly the medicine the doctor ordered.