With the recent reforms (ADVOs translating to different states and what not), they can be argued to be effective to a limited extent in that the government has been proactive in response to issues associated with ADVOs. However, the stronger argument here would be to say that ADVOs are highly ineffective because of related statistics and case studies (Jayson Dalton, Luke Batty, Sharon Micheleutti - I butchered the spelling of that name, etc). That being said, I rarely ever had a full-on "HIGHLY EFFECTIVE" or "HIGHLY INEFFECTIVE" statement - I always used "to an extent" because it gave me more to talk about. ADVOs are an area where you can go "highly ineffective" though.
To answer your question, because I don't know how strong your actual evidence/arguments is/are, I cannot tell you whether or not you should change your argument. I would suggest that you use "ineffective to a large extent" as if to provide a path to greater discussion.
What I did back when I studied legal studies was use a lot of counter arguments (e.g. despite the recent reforms to ADVOs and their ability to extend across state borders, it was reported in 2017 that ..., which [....ineffectiveness statement....]) to show higher order thinking. Counter arguments are, however, not necessarily fundamental to achieving the higher bands. They can work against you in that if you do not refute them well enough, it will take away from your argument, rather than add to it. Using simple and short counter arguments are often the way to go. Just remember that they are not necessary.
The FLA and its stipulations regarding parenting orders (those associated with equal access to children, shared parental responsibility, etc) are mixed in effectiveness - you can argue it either way because there is a lot of evidence to suggest so. On one hand, most parents actually follow parenting orders in terms of shared parental responsibility and the payment of child support (more so now than ever before due to reforms in the past 10 years). On the other hand, we see that parenting orders (mainly shared parental responsibility orders) often lock children in instances of domestic abuse and result in many issues.
That said, I do agree that they are not effective, but I would as easily agree with someone saying they are effective - it's in how you argue it...
ANYWAYS... realistically in legal studies, you can argue ANYTHING as long as you have the evidence to back it up.