Focus works fine as far as targeting goes. The issue seems to be using focus to target Hex, although I'm not sure why that would be.

The other issue for focus, is that we could be targeting Toon A with another toon (Toon B) as the focus on all of our shamans. Toon B would observe that no shamans were targeting her and think they were safe. Then suddenly target=focus nukes would land and Toon B would be dead before anyone could react. If we need to preface our Lava Burst with a Flame Shock on the focus target, we're giving them warning of what is coming, which defeats the purpose of Focus in this context. This is what a lot of people mean when they say focus is broken.