If your story is not about time travel, but it has time travel in it, then your story sucks.
For example. Stories that are about time travel:
Terminator, Back to the Future, Time Bandits, Bill & Ted, 12 Monkeys, Journeyman.
Their use of time travel is, at least, honest.
Stories that are not about time travel:
Star Trek, Stargate, Lost, Heroes.
Their use of time travel is a crutch or a gag, and all of their time travel episodes are stupid.
