It'll not be much worse than actually aiming at your target, as there's only a 5% chance to roll an automatic hit, the rest is up to scatter.
Sometimes it'll even be better to attack ground, in the case of your ISU targeting the soldier that's far away from the rest of his squad.
There are so many details in this game it's a piece of art. In the graphics, the sound effects, the voices. Every game can be a unique story, as we saw in the finals yesterday.
And best of all, it's an interactive piece of art that evolves and grows better all the time with patches!