In my opinion Brigitte is too strong on live servers right now. Dominating in almost every rank she does too much damage and has too high survivability. With a big healing output she is strong in DPS, Tanking and Healing.
Her ultimate is really strong if used correctly, but reducing her support abilities is the wrong way to go. With a 5-second cooldown stun ability they should rather work on her damage output, I think. Limiting the abilities of a support hero instead of reducing the insane amount of damage is not the right thing, I think a longer cooldown on the stun or a damage reduction from 35 to 30 or 25 would rather be fitting.