(1) is right because a wraith is humanoid. The same, as you said, for Jack in (2). The rule about 's for only people gets a little grey with animals and other vaguely animate or personified things. While it is definitely 'the table leg is broken', 'my car's left front tire is flat' is perfectly normal.
'1. The wraith's gun is so weak. 3. Jack's gun is so weak.'
What does this mean? I was planning on buying a Honda Accord, but im starting to like the Mazda's. (What does 'Mazda's' mean? Why is there an apostrophe -s?)
It's a typo, Jack, unless the sentence actually continues, reading something like 'I'm starting to like Mazda's rotary engine'. If the sentence ends as in your example, then it should be 'Mazdas'.
Are these correct? If not, can you correct them? Thanks 1. He doesn’t like Mazdas. 2. He doesn’t like Mazda’s. 3. He doesn’t like Mazda’s cars. 4. He doesn’t like Mazda cars.