It's very likely that your keyboard, mouse, monitor and most, if not all, of the electrical parts on the pcb's of your PC were made in China. Perhaps the entire unit was assembled there.
There are variances in quality in China as everywhere. You can source bad stuff and good stuff. The US distributor and/or retailer has purchased and sold the bad (cheap) stuff to you, so your opinion is understandable. They could have purchased the good stuff if they wanted to, and your opinion might not be the same.
But, cars are a different and it will be a tough road for Chinese car manufacturers to set up the service and dealership requirements to make a dent in the US market.