Depends on who you're going against and if your team knows not to hit a sleeping target. On a good team I'll use it as either a ult-stopper or sometimes I'll use it on the tank and it causes people on the enemy team to flip a bit when their meatshield is out of commission for however long. I usually also will throw it out into an enemy crowd. One less body, regardless of who it is, is a big advantage. On a bad team it's a get out of death free card, you just gotta practice it so you can land it properly in the heat of the moment.
Her whole kit is built around how well your team is doing. If you have a good team, she is a huge boon. She can heal what little your team takes, prevent the enemy from healing, and combine ults into a weapon to surpass Metal Gear. If you have a bad team, I wouldn't say she's worthless but she simply cannot shine. Her entire time will be spent healing and using her grenade on her allies rather than the enemies. One time I healed ~30-35% team damage in a game, but it was a bad team and we ended up losing and everyone was blaming me for it because I don't think people on my team really notice what Ana does unless she's screaming her ult is ready.
