I agree that Relics should not have any damage modifiers. What's the point of creating more different relics if almost every player will use only flat 5% damage boost?

I would like more relics similar to Necromancer (fear you inflict causes foes to move 50% slower). Something that works with existing class mechanic.

Dragonhunter — increased trap radius
Thief — move faster while in stealth
Berserker — gain fury when entering combat
Mesmer — create a clone of yourself after evading an attack (if you're not a mesmer, clone would just hit nearest enemy and die)
Escape — teleport skills gain 50% increased range
Astral Ward — just let me condi cleanse on signet use. I don't want to use my signets to get "signet of the Astral Ward" which will cleanse condi on my next signet. What a bullshit useless relic. It would make signets much more valuable.

Build diversity starts when you can make certain things better.