Two-hand and Defense

So this is my first time ever making a warrior character. He's coming along pretty good but I was curious about something I noticed. I plan on making my Warrior a Fighter that will master sword use and mainly only use Two-handed swords. I keep him pretty powerful and it just seems more fun to me that way, but I also noticed (obviously) that his defense wasn't to great, it's good enough to keep him alive, but still I have to recharge his hp about every 2% I make (I'm not using pots unless in danger). I generally don't like using shields and one-handed swords. I noticed that there is the skill Iron Body, but a lot of people tell me it is worthless, but I need the defense. I was thinking about ignoring Power Strike (except for the one point that is needed to be in it to have Slash Blast) and putting the points into Iron Body for some extra defense, but then again if it really is worthless to have it then I would not do it.

Mainly I'm just asking, Should I use Iron Body for some extra defense? If not can some one tell me why and maybe a suggestion for better defense (besides the obvious "Get better equips.")? Thanks ahead of time.