Guardian Greatbow build potential?

I've noticed that the Greatbow pulls aggro REALLY well, no matter the range. I'm a Guardian main, and I've been collecting any greatbows I find (preferably Golem Greatbows since I don't know how they differ from others", and I've been able to keep aggro on myself better than any relic buff I apply.

Was wondering if anyone has done a 100% greatbow build before, I was thinking of giving it a try. The Guardians damage output is smaller than most, so maybe only putting focus on defense and block shockwave with a sprinkle of rain of arrows would be effective.