My sister completed this major this semester. If you want little to no sleep throughout the semester, 72 hours of work with no sleep to meet deadlines and a strong addiction to red bupl, then by all means attempt an architecture major. I am not kidding about any of these facts, you can ask any kid whos completed a architecture major.
Most architecture courses have a high wash-out rate for this reason alone. I had a friend who studied architecture at RMIT and he couldn't handle the workload, so he ended up switching to commerce, haha. Like teaching, it's a field of study you really need to have a passion for, otherwise you'll have nightmares slogging it out.
I've heard the place to be if you want to study architecture is RMIT, not Melbourne; their architecture program is very competitive to gain entry to. Deakin isn't too bad either apparently. What you need to remember with architecture and other technology/design courses though is that your portfolio is
far more important when being considered for a job, not which university you attended.
Good luck!
EDIT: If you plan on making a career out of architecture, keep the accreditation in mind too. It's a long road as you need a Masters degree to become a fully accredited architect:
http://www.aaca.org.au/architect-registration/recognised-architecture-qualifications/