I'm ok with Ana. It is hard to hit with sleep dart since travel time is akin to Hanzo arrow. It's fun when you're playing with a competent Rein or Genji (and lesser extent Roadhog and Winston) Played Ana with friend on Rein attacking Dorado. Team killed opponents twice and boy did it feel oh so good.
She's good against the double heal comp because of her grenade, outright counter to Zen's ult. It's just hard to heal in crowds due to sight lines, particularly when an ally gets in your way from your intended target.
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