Hi,

1 People complaining, I expect don't jog long/intense enough, and therefore don't get the sporting rush.
2 Some people approach jogging purely as training, fully concentrating on training aspects, which do indeed not change in any essential way during the jog. Such a style is hardly different from stationary training, and yes, I find that rather boring, though some people find the rush itself sufficient.

Bye
                                                                  Mysha