Holden family here as well - From FC onwards - EH HR, HT, couple HQ's, HX vacationer, 2 torana's, then a couple of Commodores. After faultless runs of Corona's, Camry's and Corolla's, there are only 3 Aussie cars left - Aurion, Camry and Camira.
I think the stupidest thing on a new model is (apart from sealed trans) the variable flow oil filter in the ford ranger engines - if you take more than 10 minutes to change the oil and filter you lose pump prime and the engine will blow unless you manually re prime (which either entails tipping 15l of oil in or ripping the thing to bits.
