unfortunately my experience with vcat has been very similar
i rented a room at the start of 2017. i soon found it was infested with bedbugs. i asked the landlord to get an exterminator, she refused
6 months later and 5 vcat visits and hours of paperwork and i was awarded $1,070 compensation from vcat (which i have yet to receive)
the cost of an exterminator is about $1,200 - $1,600. so it was just cheaper for the landlord to do the wrong thing and go to court
in addition, she didn't lodge my bond money with RTBA and kept it. this is illegal, and i reported it to consumer affairs/justice department. the vcat member said to her "in future, lodge bond money with RTBA" - but she received no penalty
so yeah, i can corroborate other peoples' experience here - the legal system for civil disputes is very weak
my recommendation to the guy who's had a dispute with the builder is pay a web developer to setup a 'name and shame' website (costs maybe $500). this will cost them money in lost business plus warn other people so they don't suffer like you have (it's *a lot* of stress doing legal stuff)
i've done it before to a business that withdraw money out of my bank account without my permission. i better not put the link here because the mods will think i'm doing SEO. the business wasn't fazed by the vcat case i lodged against them, but they certainly didn't like the expose website about what they were doing