Well, IMF has to explain why it threw billions of dollars to an unsustainable debt.
But there are deeper issues too. What the creditors really want is to micromanage Greece while they do not understand our economy and culture. They want to change everything in a couple of years. Change takes time, you can't turn a Greek into a German or an American in 3 or 5 years.
In order to do this and protect their interests, they support the previous, crooked goverments. These people acted like lapdogs, signing everything the creditors threw at them, whilst implementing only what didn't touch their rich friends.
The creditors did not only got binding agreements through them but also protection. Siemens for example, the German conglomerate that accounts for a large percentage of Germany's GDP has spent over 2 billion euros (!) in bribery to Greek politicians and public servants. If this case ever reached the court, both our politicians would face jail and Siemens wouldn't be able to work with the European public sector again (think from traffic lights, to trains, hospitals, energy, etc). Thus the creditors prefer a goverment that looks like an obedient and honest goverment, whilst it only applies austerity measures for the weak and protect themselves.
Our new goverment seems genuinely interested to make things better, but it asks for the freedom to implement their own ideas in order to reach the targets set by our creditors and also a debt restructure so that our debt becomes sustainable.