I do not think this deal is good, I think it is far below what you should get for moving to another very different country. I do however think that people should know the facts and to say that you would get no where near a deposit is just not true. Yeah if you have kids and need a big place then not a chance but for a single guy a two bedroom ok size place in Tung Chung is about the 3-4 million price range. You can get a 90% mortgage on 3 million and stamp duty is not outrageous for that amount so for about 350-400,000 you could get somewhere. Repayments could be about 15K a month. Use the rest for tax and repayments. After 6 years will be below the 70% outstanding so could switch mortgage and rent the place out when you move back home to fly for someone else.
You will however never be able to afford a descent sized place or support a family whilst living to a standard similar to home. It is a small place for your whole time in CX.