I find Bastion has a lot of problems accomplishing a much of anything, unless a good portion of the enemy team plays to protect him. A Bastion without any support is super easy to get around.
Also, I like Ana a lot! I play mostly supports in this game; I have 15 hours on Lucio and now 5 hours on Ana. I think she’s super fun, and you don’t really have to be a great sniper to play her. I find she’s actually much better mid-range because the grenade and sleep dart are hard to land and pretty ineffective at long range.
The grenade is actually amazing; 1 grenade + three shots basically full-heals any character (+100hp for grenade, and then +75 heal per shot * 3 shots * 2 grenade multiplier = 550hp. It’s also really good against enemies that have a support baby-sitting them or that have a lot of self heal, since it blocks healing. The debuff even stops enemies from picking up health packs.
Also, it’s great to use against enemies at point-blank range because you can catch both them and yourself/an ally in the blast, which creates a giant health swing. You gain 100 health and they lose 60, for a total swing of 160.
Her sleep dart is an amazing ultimate stopper (I had a game where I hit McCree with it every time he ulted) and sort of hard counters Bastion (unless he has a Reinhardt shield or a very persistant D.Va). It completely knocks him out of turret mode. If the enemy team has a flanker that’s bothering you, it can even be used for that (although flankers tend to be pretty mobile and the dart can be hard to land). If you do end up putting someone to sleep, you have a lot of time to run away. If they’re low enough health, you can even attempt to burst them down with a shot -> melee -> grenade combo (170 damage, and each move cancels the animation of the previous one).
Ana’s ult is probably the weakest portion of her kit, but it can still be very effective if used at the right time. Paired with an offense hero’s ultimate or a tank it can be the little bump you need to swing a fight in your favor. It’s pretty ridiculous when paired with a Genji ult or just thrown on a Winston right before he jumps in. It’s no 5 man res or a teleporter, but Ana more than makes up for it with her high burst healing and the general utility of her kit.