Holmgang - How often do you use/abuse it?

[Shinkyo]

Snip

Yes using Holgang is better on the criticals if it's coordinated with your healer.
They don't have to pre-shield you or spend GCDs to top you up, nor do they need to immediately heal you. It's more GCDs both healers can spend DPSing.
Also, that frees up CD you can use elsewhere in-between Crits.
I don't think you should aim to use Holmgang as much as possible, but you should use it when it's most valuable in a fight.