Mercy Stroke is really great to have. Depending on the content your doing and who your going with. Its also really good in T4 on the dreads cause its free DMG and who doesn't like free DMG.
My setup

Mercy Stroke
Invigorate
Blood for Blood
Bloodbath
Fracture

Bloodbath is great. Its true that a mage can heal you, But Being able to heal yourself helps them out a lot. I use it in AK a lot if I take hate of a tank, Really nice in T2 on ADS since you can't dodge vaccum wave.

Incase some people don't know Crit hit effects Second Wind so I can heal myself for some pretty good numbers.