Protection: Probably not. It only reduces 1 damage point per hit (or thereabouts), although it does work for the entire group.
Armor Implant: No. There are more effective implants.
Increase Mass: At level 6, because there are no penalties to dodge and hit %, it is worth a serious consideration. At lower levels, the loss of 10 dodge means that that the skill has a negative effect on both survival and damage output. It leads to the reduction of about 6 damage per hit. Against mobs, this could be significant, although against harder hitting bosses, not so much. 17 damage versus 23 is quite substantial, although it will be less noticeable against enemies that hit harder.
It is open to debate. At the very least, let's just say that iron blood is a far more potent skill.
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