Every incarnation of Trek has had its detractors within the overall fan base. From what I've observed, the set of Trek fans who indiscriminately like every Trek series is a minority. Most aren't fond of one or more of the shows, usually ENT or VOY.
I am probably close to being in that minority. I might personally favour certain series over others, but don't actually dislike (or denigrate) any.
Funny. One recurring theme of TOS was the joy of diversity and trying to understand and respect each other's differances. Seems like some Trekfans do their damnedest to ignore that in their treatment of each other. Not most, but those that do are numerous enough (and certainly loud enough) to greatly disillusion the remainder.
That is the main reason why I opted out of organized Trek fandom for over twenty years. Robust and honest discussion is fine; throwing insults and constantly bitching over what are really just differances in personal taste is not.