This. D.VAs ult used to be super easy to hit, you could literally get on top of a point or payload and use it and you'd get POTG.
Then, we went through a phase where you'd launch it vertically and get the POTG
Then we had firing it in a straight line.
Now you really need to be inventive to land it. Usually I get a few kills from flying into the inside of a building and trying to get it so it detonates by the nearest door to the payload / point, as thats usually where people will run into. Best bet is Zarya ult, or flanking from behind.
Honestly though, unless I see a decent oppertunity, I save my ult for overtime