There are actually two demos for KZ3. One for the multiplayer online and another for the single player campaign. If those aren't enough to help you decide, then you probably shouldn't even be asking the question.
But anyone who admits they don't like FPS games probably isn't going to be swayed by any example of the genre, much less KZ3. For all its merits and general level of intensity, it's still an FPS.
I ordered two copies after playing the single player demo. I was that satisfied. One for myself and another for my brother who only plays FPS games in single player mode.







