I think there is a big slice of perspective you're missing here.
Yes, at the higher levels of power everything is dirty.
However, you have to look at what the consequences of that are, how it manifests in a society, and how far it spreads.
And in Germany, it works pretty well. Yes, enormous government projects don't always go to the most capable or efficient. Yes, big business owners contribute to politicians, avoid taxes, and erect legal obstacles to competition that would benefit society. However, the society basically works. The corruption is not interfering with basic services to the people. A journalist can write what she wants without fear of physical reprisal. Individual property rights are by-and-large respected. School teachers actually benefit the children. Police officers don't operate as a tax force on their own behalf. Thats not the case in every country.
So while I agree with you that even the 'best' countries still have a very real battle to maintain integrity, there is absolutely a spectrum and largely, North America and Western Europe are near the top of it.