I'm sure this is a common view among many of my teacher colleagues, standardised testing sucks.
NAPLAN has become more about glorifying the academically enriched schools and punishing the schools in low SES areas or those that have different focus areas (e.g. sports via an academy). The results published on the My School website are used to discriminate and judge, without taking into account other factors of a student such as interests, circumstances, etc.
Parents send kids to schools based on these results (again, discriminatory) and if we consider equity in terms of funding and allocation of resources.. of course a school that doesn't have said resources will perform lower.
Students are withdrawn from the NAPLAN by parents which therefore affects the results (this is a starting point). Secondly, it assumes that all students achieve the same and can access the content in the same way.
Schools have even started dedicating sessions to NAPLAN mastery which in my opinion is a massive waste of time and resources, when students could actually be learning.
The emphasis on differentiated learning and targeting students at their point of need, rather than the "year level" which they are at. I just think, the way teaching is moving from chalk and talk/robot instruction to targeted learning conflicts with the idea of standardised testing and should be abolished altogether.
As you can probably tell, I feel very strongly about this and think it's a massive waste of time.
I guess if I had to support the idea of NAPLAN in any way... and believe me it was tough to find... it is somewhat useful as a supporting tool. Teachers get access to student NAPLAN data and areas of achievement/weakness. This, used in combination with other methods/data could be beneficial in some way. Obviously the public doesn't get access to individual student-by-student data so it is ineffective for them.