Hey!
Well I would say 'yes', it is important. It's the place where you get the information for your course. It's the place where you take notes, from which you study off. And you wouldn't want to waste your money and not attend lectures.
But of course, some lectures are not favourable for us. It may be the time gap between classes or be it having to commute to the university during certain days. In saying this, Macquarie has 'ilectures' where you watch at your own convenience at home. So you may choose to watch these instead of going to the actual lecture. BUT just be aware that you must always keep up with the lectures you missed. You don't want to have to watch 10 lectures a day before your exam!
Just on a side note, tutorials seem 'more important' by some because your tutors can answer your questions and its a smaller class where they mark attendance, as opposed to 'lectures'. Nevertheless, its good to still attend lectures. For all you know, you may concentrate better in them as opposed to watching a vlog and therefore retain the information better! Plus I must mention that not ALL units have ilectures on offer, in which case you MUST attend your lectures if you want to do well.
Just my 2 cents, but I hope it helped somehow!