As someone with a Tibetan Mastiff I can confirm most of these. For example, #2 for their original purpose of guarding against wolves, leopards, etc. One additional detail is they're one of the first dogs to utilize a spiked collar, to protect their necks against them.

7, can confirm. My pup doesn't want to come inside since its gotten below 40 degrees F. He loves it so much.

8, they're actually better watch dogs than guard dogs. They'll use their bark and size to intimidate any potential intruders. Their bite can be strong, but it won't be nearly the same as say a German Shepard.

If anyone is interested, I recommend this book (recommend kindle version just because of the price) since it covers not just owner care, but history and expectations too.

http://www.amazon.com/Tibetan-Mastiff-Comprehensive-Owners-Guide-ebook/dp/B008BGDI7M/ref=sr_1_2?ie=UTF8&qid=1417629856&sr=8-2&keywords=tibetan+mastiff