There are degrees of corruption and incompetance between the 2 major parties. One is advocating pretty much a no-holds-barred return to late 1800's style regulation for labor and business (with a few members even going so far as to advocate for child labor) and the other is at least willing to throw the poor and working poor a few crumbs.Republican and Democrat politicians are the same people. There not a single difference between them other than who's vote their trying to buy.
Even if you don't like or trust them it makes sense to support and vote for the party that is at least willing to toss some crumbs at you.
In the long run if you really want to change things you continue the practice of voting for the lesser evil during primary elections when candidates are selected. That is how you will get rid of the incompetant incumbants and corrupt representatives, and eventually, improve the government. If you want a practical real world example of that strategy than do some googling or reading up on the end of the Gilded Age in the late 1800's/early 1900's. The corruption and incompetance that was common then is unbelievable to most today. Yes even after the bail outs and TBTF.
Voting for the lesser evil isn't very satisfying to say the least, but it is the only reasonable and sane option we have at this point in order to reform the government. And perhaps bizzarely the most optimistic too. Most others either advocate apathy (which is what you seem to be drifting towards, but that is just my impression from your post) or Revolutionary War 2.0 arm chair theory crafting.