We know Reflects Damage has been a little more challenging for some players in this patch, so we've been reviewing feedback regarding the affix pretty closely since 1.0.5 released. The actual values for the stat haven't changed at all and, in general, it seems like the issue for players is really just related to increased monster health thanks to Monster Power.

Since monsters have a lot more health in the higher MP levels, not only do fights last longer, but players need to do a lot more damage in order to kill their targets. Of course, that means there's a lot more opportunity for you to get hit with Reflects Damage. So, whereas before the patch, a player may have been able to kill monsters with the Reflects Damage affix no problem and with health to spare, now that fights are lasting longer that same player may not have as much success -- at least, not without making some adjustments to their build or gear.

That said, we do agree that we can make some improvements. For example, we'll be making it so that damage dealt by pets will no longer reflect back to the player. We're also toying with the idea of changing Reflects Damage so that it has a duration and can only be activated by monsters periodically (rather than it always being active), but that's definitely not yet set in stone.

Molten and Desecrator can be particularly deadly since they have a chance to both stack with themselves and with each other, and it can be easy to miss in the heat of battle. We’re comfortable with the way both affixes are currently working, though, since many gamers are well versed in "don't stand in the fire" scenarios. Just keep an eye out for those ground effects!

good news about reflect damage affix:

http://us.battle.net/d3/en/forum/topic/7006893362?page=2#31
and some info about molten/des:

http://us.battle.net/d3/en/forum/topic/7004342936?page=3#45
as a dh reflect damage + extra health is pain in the ass, cause it's an affix that you cannot do anything towards it. as for all other affix we can respond to it: that is run away from them.