I agree. They didn't have to show Ginny's magical skill in this last movie, especially considering how many other plot points were absent. But they had at least 2 very distinct instances where Ginny was just whoopin' ass with her magic. That last scene where they were fighting death eaters and she just blasts them with a spell was very 'whoa'. I think the fact that she has tremendous power and skill will be important in Deathly Hallows.