Two quick things:
1) We're looking to redesign how the Reflects Damage affix works, as well as make it so that pet damage will no longer reflect back on the player. I went into a bit more detail here. (I believe the buff while active will have some sort of visual indicator, too.)
2) After seeing a number of posts from players about RD dealing what they felt to be TOO much damage (especially from minions), we did some additional testing and discovered that Rare minions with the affix were in fact doing more damage than intended. This is an issue we have scheduled to fix in an upcoming patch.
I'm not sure if these points would change your opinions at all on the subject, but I felt the information was worth pointing out.
Why are the changes coming now? According to the blue post, this is needed since the introduction of Monster Power levels brought on a combination of longer fight duration and the need for more DPS, meaning there's "a lot more opportunity for you to get hit with Reflects Damage". Having the posts in mind, those nerfs should be welcomed with open arms by summoning Witch Doctors who are in possession of many sources of damage that can potentially backfire lethally.
Source: Battle.net