To a large extent yes. That series did ignore her earlier accomplishments and skills, and it changed her character in many respects.
But it unfortunately had to do that, because War Games overshadowed everything that she had ever done that was good and she had never been allowed to have any sort of redemption beforehand. Then editorial mandate had Batman deliberately force her to repeat the same mistake at the end of the Robin series.
So there was no way to write her other than as starting fresh. And her personality changed as well. True-she lost the anger issues she had, but that was because she chose to lose it. She started acknowledging her own failings and working on them instead of blaming everyone else, and the anger she felt towards everyone went away. That's when she chose to 'represent hope' instead of just being another vigilante.
And it was after that change and that earning of respect that her past as Spoiler could begin to be treated with respect. 'I dated Robin. For five minutes I was Robin. That has to count for something.' And 'I was trained by the actual most dangerous people in the world.'
If you look at her first fight in issue 1 she's actually a lot more brutal in how she fights, deliberately breaking a guy's leg. She isn't fazed by a guy holding a gun at her, and she doesn't even look at him when throwing a batarang at him. Then in a flashback to when she was still Spoiler she was shown being a mirror image of Cass. Her fighting skills didn't improve-her style just changed and with the change in attitude people started noticing that she was actually pretty good.