And universally loved, well, I can again look at these boards, which back in the day had plenty of acrimony between Firefly fans and anti-fans, before the show as even cancelled... and all over again when the movie came out. And battled ceaselessly ever since.
That battle will never be won, and will never end. For *any* show, FF or not, there is always a war between its fans and those who are not fans. Sometimes this war is pleasant, sometimes not. But it must always exist.
To put it another way: No show is so good that somewhere, someone will not hate it; and none is so bad that there's no one who *likes* it. That's one of the few examples of a 'middle ground' that I personally believe in.