I'm pretty sure that Sasuke did not purposely miss Temari.
The first shot with multiple fireballs may have been a distraction to get her onto the ground. (By the way, she stood in the middle of that fire and completely ignored it)

But the second shot with the big fireball was definitely aimed at her. He was talking to himself about pinpointing her, and the shot hit her dead-on.

There was a nice delay during which he asked himself if he hit her. All this time, she was chillin' in the middle of the fireball.




It looks like the only time a fireball jutsu was effective was in ep 68 when a leaf nin blasted away a sound nin. That violet flame shield was cool, but you gotta admit that anbu guy was dumb to jump right into it.