Symmetra
Let’s go ahead and get the obvious out of the way. There isn’t a single Overwatch hero that received a rework quite as massive as Symmetra’s. If you’re a new Overwatch player who has already become accustomed to seeing Symmetra picked for nearly every game on defense and even getting quite a bit of use on attack on some maps, allow me to take you back to her humble beginnings. Before Symmetra became the human microwave that she is today, she was a hero that would only make an appearance if a player wanted to troll their own team. That’s just how useless she really was. Initially, Teleporter was her only ultimate ability and giving her teammates shields was an ability of hers with its own cool down. As for those sentry turrets, which were the most useful weapon in her kit, the cool down activated every time you placed a turret. This all goes without mentioning that her damage was rather lackluster as well.
Now, we’re looking at a whole new Symmetra. She is the only hero in the game to have two ultimate abilities. She can now place a teleporter for her team to use or tuck a Shield Generator in the background that grants shields to all teammates in range. The cool down is no longer required for placing turrets so players can set up all six of her sentry turrets without waiting around hoping to survive long enough to even plant another one. With a nice buff to her damage and the added ability to create a Photon Barrier, Symmetra is a viable character that feels more like a defensive queen than she does a support character. The community remains a bit divided about whether or not that’s a good thing but you won’t find anyone complaining about it over here.