Count me as another old-school Trekkie who was seriously underwhelmed by TNG when it debuted in '87, enough so that I was actually taken a bit by surprise to find myself really liking an episode ("Measure of a Man") when it first aired during the second season. TNG definitely got better as it went on and became a worthy successor to TOS, but, yeah, the "That's not my STAR TREK" effect will be with us every time a new iteration of Trek comes along.
Fifteen years from now, future fans will complain that the new, new, new Trek isn't as good that classic stuff from the early 21st century . . . .