The Legion Assassins that are suppose to come after you periodically once you've reached a certain negative rep with the Legion is just an example. The quests and the affects are one of the big reasons why I love playing New Vegas and I know some don't work as intended. Is there ever going to be a patch will come out and address them?
This is slightly off the topic, but when i was playing i noticed the Legion Assassins did not attack me for about 18 game days, then suddenly 20 Legion Assassins attacked me at once.