Shield & Survivability...???

This is my current build. I know I can move some points out of the 2H weapon attack speed and damage to gain a few points but other than this I seem to be having a REALLY tough time surviving. I'm not sure if my build is just jacked up or if I'm seriously under-geared for merciless. I want to have a shield tank marauder that can actually survive most merciless areas. I'm working my way down the bottom of the skill tree to get berserking and unwavering stance. I've been told that iron reflexes is a MUST but I don't think I can benefit from most plate gear as it does not have any evasion rating to begin with other than maybe benefiting from grace aura I don't see the point in heading WAY over there. Any input is greatly appreciated!

http://www.pathofexile.com/passive-skill-tree/AAAAAgEAe4whAir2567kUfcrMBkx-3A-oLTG2FhjPfxQUIzP9kh8uF8_KS5nm8EEVbWezacw974UIFBHFHEOPDpS37-GYFYErj534zwtDPckJcT2d2KEY-TxJ-3z3VRJ51LvDrnd8i-oGGoeajsg8ETnHOfGrv4K8kXnY7c-erhs9q6Tplc64YjxIVXcPfuqZtkY1zS-tHM=