could you really tell us how you feel?
those 3 different posts about the same thing pointing to your web page didn't get your point across.
many of your points are common for many of the engines from all dealers.
like the long throttle cable. normal.
tensioner that needs more parts to function. come on. out of your 12 total posts 3 have been to complain & the others are in the thread about how to fix tensioners.
missing hardware. yea many of us all have been there.
cross threaded mount sud. many of us have already redrilled & tapped those & the intake & exhaust.
also many have had either a cdi or mag go out shortly after getting the engines.
complaining about that you could get it all cheaper somewhere else.
they were upfront about their price. so that would be your fault.
here are the links to fix some of your problems
http://motorbicycling.com/f39/norm-shortening-throttle-cable-9010.html
retap - Google Search
i know you feel buthurt. i know i was pissed @ my bike for awhile till i fixed all the problems & i have read the same from others.
you say he used "that's-the-way-the-kit-comes-so-deal-with-it argument".
gues what? it is true. the china girls are crappy china engines that like a bit of love up front. if you take care of some things, it will get better.
you still might have a couple more problems with the engine.
so to answer your anology about a car deal, when you buy a yugo you get a yugo. pffffffffft
the best advice that can be said is to use the custom google search & the top of the page. it would have/will answer >75% of your questions.