In all of the individual Diablo III-related compromise cases we've investigated, none have occurred after a physical Battle.net Authenticator or Battle.net Mobile Authenticator app was attached to the player's account, and we have yet to find any situation where a Diablo III player's account was accessed outside of "traditional" compromise methods (i.e. someone logging using an account's login email and password).
This is all new to non-WoW players, so the misinformation and rage is flowing freely.
I've been using a mobile Authenticator since it was released for Battle.net and I've never had any problems. Nor did I before I started using the Authenticator. Since I've started using it many people I know in WoW had their account "hacked" and they never had an Authenticator.
There are many ways that someone could "hack" an account, most of them end up being enduser error. This doesn't mean that there couldn't be a leak somewhere in Blizzard, just means it is very unlikely and I'd bet 99 times out of 100 that the source of the compromise was on the users end.