When Melbourne made all trams free in the city centre, trams became unbearable to ride. It used to be just one tram line that was always filled up, now it's every single tram as soon as you get to the free zone.

The transport system was better before Myki in my opinion. More affordable, weekly passes, and paper tickets. In contrast, Sydney's transport used to be a mess with every operator requiring a different ticket, so no transfers from train to bus or ferry. Now with Opal, everything is much simpler, and the best part is going to the airport is really cheap now, if you let your Opal card go negative :)