need some help on my 2H mace marauder build

http://www.pathofexile.com/passive-skill-tree/AAAAAgEBAdwCcQSzBS0OPA_MFCAUTRRxGNsZLho4G_ohAiFVIWAl3yftKLUq9jIJOQ46UjqzOthAoEE_R35KfU3YUEdQUFHmVElWBFb6Vw1YY1nzW69fP2BLYIhhIWFSZ6ByqXTtdPF673uMfLt82Xz1hNmE74Zgh3aKIox2jM-QVZ65ns2fy6IApBmmZKcwp4SpaKvFrKq0L7ndwBrApsDzxYrG2MmY0iHUj9lh3Q3ewd-_4urkredS7DjvDu9O8B_yL_Pd9kj8xQ==
here is my passive tree
my marauder is 79lv
about 4400hp 3550armour 80all ele res
11500dps with glacial hammer and 3300dps with sweep or ground slam

Is it necessary to get iron reflexes?
Is armour really useless?


sry for my bad english XD