Yes, a CEO in a private hospital answers to a board of directors--- who are generally only interested in profit margins and dividends to be paid to stock holders. Private enterprises are in the business to make a profit. Which perfectly explains why governmental regulation is necessary to insure that businesses are conducted in such as way as to provide the services they are paid to provide and that they do it in ways that are fair and safe.
My local DMV is pretty efficient. There's nothing I can see corrupt there. Some DMV locations may be less efficient than others, but that's more than likely due to layoffs that have created staffing problems. A short-staffed office with fewer people working fewer hours are not going to provide the same level of service as a fully staffed office can. As long as corporations are not paying their fair share of taxes, there will be no way to fund agencies to the level that they can all provide adquate staffing to meet our expectations
As to the Post Office, it is completely self-funded. In 2006, Congress passed a law that requires the Post Office to pre-fund 80% of its projected retirement benefits well in advance. A portion of these benefits are for employees who haven't been hired yet. This is a burden that no other federal agency or even a Wall Street corporation is required to bear. This was strategically planned in order to create a budgetary crisis to cripple and then dismantle the post office. These would leave citizens at the mercy of private delivery services, with fewer choices for services that are already more expensive than the post office.
As to the "over budget military," the congress determines the federal budget. As long as greed and warmongering set the tone for policy, way too much money will be spent on military spending.
As I answer the points of your post, it occurs to me that you are buying into the FUD hype. Fear, uncertainty, and doubt. Certain mass media outlets serve no other purpose than to repeat key talking points solely intended to generate fear, uncertainty, and doubt. They seek to influence people to vote against their own best interests. In order to do so, they seek to make people resent government.
Personally, I like having clean water to drink, and safe foods to eat. I like having decent roads, highways, bridges, water systems and other forms of infrastructure. Just like public education and fire/police service, I think health care should be available to everyone. These are the sorts of things government should provide.