[batmanthehorse]

That's either an old screenshot or they've disabled some features. The stock game has a red outline around all enemy characters and red names over their heads: https://vice-images.vice.com/images/content-images/2016/09/0...

[LindenRyuujin]

The outline certainly helps with team identification. I don't play Overwatch so it is certainly possible things have improved a lot, but from the video I linked before I think it still looks very noisy to my eye.