Public Transportation in Adelaide

What do people think of public transportation in Adelaide? I mean for a city of this size it's okay but not great. Traveling across country has shown me there are pros and cons for every transportation system. But Adelaide seems to be way off compared to rest of the country. I want to hear everyone's opinion on this because it doesn't seem the government is spending money in right places. I still don't know whats the point of tram yet. Many places are disconnected to each other. Late night transportation is worse. Even if two suburbs are only 10-15 minutes away by car, you might have to go to the CBD to change for another bus. There are lots to complain about SA transportation and I have been only staying in this city for only 1.5 year after moving from Melbourne. What do people think?