Dodge is simply unreliable. Even if you can dodge most power attacks by 70% there is still a 30% that you will get hit and if in that single hit your life would be reduced to zero, I'd rather take more mitigation.
Get better gear and use dodge rune/skills. Dodge isn't bad and it isn't good. If you can't takeone hit from thunderstorm or other affixes then lower the difficulty because you aren't geared enough. We aren't gods so expect to take damage.