Blizzard recently changed their spectating experience in order to accommodate the demands of the viewers. From having a third party viewing experience to making a very strong performance with the color combination, Blizzard have definitely made significant changes for the better.
However it seems that there are still some problems to be ironed out. The performance of the players and the teams is much easier to track, but the health bars being unproportionate is definitely a big problem for the players. It provides an unfair advantage to the defensive players and is defintiely not good for the balance of the game.