So if someone in Default Trust left me feedback everyone in Default Trust would see that feedback?
2) Does this apply to the (1st) bold number too?
3) Where can I see other people's trust lists?
1) The bolded part is not correct. Not everyone in DT would see that feedback because they might have modified their trust list. But everyone that have DefaultTrust on their trust list will see that feedback as trusted as long as they didn't exclude the user who gave that feedback.
2) The first number is simply calculated from the second and third number. it doesn't have direct connection with the feedback.
3) https://bitcointalk.org/trust.txt.xz . A username1-/>username2 means that username1 have excluded username2 from their trust list.