A nice little nugget from the news, for those who aren't extra-sharp with black backgrounds:
Originally Posted by Blizzard Entertainment
Is recklessness granting immunity to fear intended? Currently It does, but the tooltip doesn't say so.
It's a leftover bug. Fixed in 5.1 I believe.
In short, enjoy eating dirt for a whole patch cycle. Guess any measure of viability (as of berserker wasn't good enough) is beyond any concern, looks like we just got "leftover" as a class.
More seriously... it's amazing things like this aren't hotfixed or even noticed sooner. From what I'd imagine, priests wouldn't be too happy either.