Blizzard have released the latest balance patch for Heroes of the Storm, and it's fair to say it's a mixed bag. On one hand, Sgt. Hammer received a much needed rework. On the other, almost every other Support Hero (besides Li Li) was nerfed. If you're unaware, or have been out of the loop for a little while, it's largely because double Support compositions are very much meta. So much so that it's almost mandatory to bring two to the party. Based on the update notes, it's likely Blizzard are trying to upset this approach to team compositions, with most Support Heroes receiving nerfs across the board (notably to health, health regen and abilities). 

Full notes here.