Usually non-fans don't post on message boards dedicated to the shows.
Voyager is part of a franchise which is loved by millions of fans worldwide, and many people that love other parts of the franchise don't like Voyager, so they say so. It's no different from Star Wars fans bitching about the prequel trilogy, or some LOTR fans complaining that the movies are crap compared to the books, or The Godfather fans complaining that Part 3 was crap, or Mercenaries fans complaining that the second game was a buggy mess, and on and on and on and on...
(refuses to break out into a horrifying rendition of Don't Stop Believin')
My problem is that they set Voyager up with a complicated premise (the entire political situation with the Cardassians on DS9 and TNG was manipulated so that the Maquis could exist for Voyager) and then they mostly abandoned it. It may have been UPN's fault that it was dropped so quickly, but knowing that doesn't make the problem (as I see it) go away. Call me a "fan" if you wish, it doesn't change the fact that I actually am a fan of Star Trek.