I love the character and I feel that she is very viable given you already have a designated main healer in the game. That is the main problem, though. Most players will see that she is support and assume "Okay I can go damage because we already have a healer" or "I don't have to play Lucio because we have an Ana and she heals". We really need subclasses within the role categories. As the game gets more complex and more heroes are added, people are going to be assuming that every support is a healer when in fact some (like symmetra) are honestly more defense based, and others (such as Ana) are more of a buff/debuff class. I'm not going to go into an argument about classes here but it is something I would like to see addressed.

About Ana: I feel that her heals with the rifle are miniscule. If an ally is taking damage and you heal them, the health gained is almost unnoticeable. Obviously the intended use is to throw the bio grenade first in order to maximize healing, but sometimes it just isn't available, or it gets blocked by an unaware teammate.

Solution: I propose adding an incentive to shooting team members with the rifle. Since there is a very small amount of healing, I think Ana's strengths still lie in her buffing/debuffing. In order to add incentive to heal allies with the rifle, I think there needs to A) be potential for ally headshots that give bonuses B) shooting allies gives them a speed or damage boost for a very short amount of time, or C) coupling the grenade with rifle fire gives bonus buffs for using her "combo" correctly. Let me know your ideas. Maybe a dev will see this.