I loved playing Grey Warrior with a LS lean. I envisioned him as something of a Samurai - one honorable, loyal, dutiful, somewhat arrogant and entitled and prepared to do what is necessary, if duty demands such.
Turned out great. Much more depth to the story than the "Stupid Evil" Dark Side, or "irrational wuss" Light Side, both of which I played through in Beta.
I agree, but if you stay "grey" then you won't be able to use the better relics, who require dark/light side V