Sorry to hear about your problems, welcome to the RV world
Our 210WBS came put together pretty well...things I would have done differently, but, then I over-build everything and I'm a neat-freak. On the whole though I found mine well built and the hardware is the same that you'll find on any TT...all the builders use pretty much the same hardware, they just build the box the hardware is installed into and attached to.
As for the manuals and warranty cards...you should have had a walk-through when you picked your TT up, that would have been the time to notice manuals missing (I asked for manuals when we stepped into the TT and then as they were demonstrating each feature, I'd look for and if not found, request the manual for that feature). Some features, don't have manuals (the hot water heater by-pass for instance) and you just have to figure the feature out (one of the great things these forums exist for 8) )
The warranty cards are what they are. Just like buying a toaster oven, you've got to send in the card...you just bought a big box full of toaster ovens, air conditioners, ovens, refrigerators, microwaves and stereos...got to send in the cards for each, just as if you bought each one separately.
Again, welcome to the RV world. As I was taught in my younger days, you'll meet thousands of great folks and few sore heads. Enjoy your TT and don't be afraid to ask questions. Nobody is born knowing everything.