It was a much needed reduction from irresponsible levels of spending that got them into trouble in the first place.
Case in point retirement age. It was 58 while in Germany it is 67. Why should Greeks get to retire earlier than Germans, and why should Germans pay for it?
Almost none liked the austerity imposed on them. (bolded for emphasis)
Imposed by the people bailing them out. If you get into financial trouble and ask your parents for a bailout, you may not like them telling you to cut your spending but they are perfectly right to tell you to trim your budget (especially if you tend to spend more than them of certain things!)
The stupidity of austerity is that it didn't work. It resulted in higher deficits, not lower ones. It resulted in more debt, not less. It is not even hard to see why. The reduced government spending tanked the economy, resulting in lower tax receipts and higher deficits.
The so-called troika that imposed the austerity as a condition of bailing out the Greeks were well into fantasy economics. The IMF and at least partly, the ECB, two of the three members of the troika have backed off of austerity as a solution. It is only the German dominated EC that has stood firmly behind the stupidity that is austerity.
Just like the US it was a center right government that caused the problems originally, not the current government. It is more than a little disingenuous to punish an entire country because of the actions of idiots that are no longer in the government. Especially when the austerity policies are so counter productive.
The retirement age maybe lower than the German's but Greeks work more hours in their lifetimes than the Germans because they work 20% more hours in a year than the Germans.
Austerity is much harsher on the Spanish and the Italians, they didn't have as high of a public debt as the Germans going into the Great Recession that has turned into a depression for them thanks to the austerity imposed on them. They had bought into the entire supply side fantasy of self-regulating financial markets that caused the financial crisis that lead to the depression, the American import that no sane country wants.
The Germans escaped only because their mortgage underwriting standards are written into law that is very hard to change. The German financial markets couldn't play the games that they played in the US and elsewhere in Europe. The problem was that the German money could go to the other countries like Ireland, Italy, Portugal, Greece and Spain where they did deregulate the financial markets and the sales of the Mortgage backed securities. And the Germans felt safe investing in those countries because they are EMU countries and they knew that when push comes to shove the ECB would bail them out, which is what happened and is still happening.