Australian Department of Immigration review: Extended delay in processing visa application 3

I have lodged my permanent residency application about 3 years ago. I m from a middle eastern back ground and a very highly skilled person.
The australian immigration has held my visa case till now w/o letting me know when the visa comes through.
Seeing the european people who would normally get their visas in matter of weeks, makes me feel extremely descriminated and I don't know whom to refer to. I want to settle in this beautiful country that I have been working in for the past 5 years on full sponsorship basis by an engineering company, but w/o the visa in hand I feel always uncertain about what might happen tomorrow. My question is if it's normall for DIAC to hold middle easter PR visa cases for 3 years and if it's legal not to provide even a simple answer on when I can expect it to come through.
I am loosing my faith in people sitting in this department and have begun to think these delays are considered deliberately to make us give up the intention to come and stay here. No one I have referred to has been able to provide any answers. Even I referred to Ombudsman once and they took my case numbers. And that was it and I never heard anything from them since. People talk about additional security checks which has to be done overseas, but HOW LONG it's going to take? One month, two months, ? It's been 3 years so far and still no news.
I feel really let down and frustrated and don't know what to do.
Can anyone help me please?