change in history had turned allies into enemies, with Worf trying to kill people who were his friends in the "right" universe.
Isn't that basically what Regent Worf was doing in the DS9 episodes? Garak may not have been Worf's friend in the RU, but a lot of those other people are.
Me, I'm wondering what Troi would have been like in the alternate timeline. Perhaps Starfleet would have employed Betazoids to use their telepathy on the offensive, as it were?