I'm a casual fan, too. Seriously. It does seem those who aren't adamant one way or the other are a huge minority. (I just realized that I only referred to "Star Trek" in my first post, referring to the movie, not the franchise altogether.)
I enjoyed the original series, mainly for the incredible cheesiness. Remastering and improving the special effects seems like blasphemy to me, since it was the goofiness that was much of its appeal. I liked Next Generation, which had better effects and storytelling, but was, at first, an attempt to do something new within the same universe. Later on, it and its spinoffs took themselves way too seriously.
I thought Voyager had potential, sending an entire crew to an uncharted region of the galaxy with new aliens, new worlds, and no clue how to get home. I think that idea lasted five episodes before they were back on Earth fighting the Borg and Trek was taking itself too seriously again.
Never cared for DS9. Couldn't get through an entire episode. Didn't watch Enterprise, but enjoyed the few episodes I saw, though I thought the time traveling bad guys were sort of a stupid way to tie it to the NG era.
I've seen Search for Spock, The Voyage Home, The Final Frontier, The Undiscovered Country, First Contact, and whatever that stupid-ass second NG movie was with the condom-headed aliens. First Contact was the best of these by a long shot.
Now, it's a relaunch of a series I know will take itself too damned seriously again in a few years. It always does. I'm just indifferent. I don't hate Abrams, but I don't much care for him, either. I do know that Orci and Kurzman wrote two of the most fucking godawful screenplays ever filmed, and they claimed to be as big fans of Trek as they are supposedly of Transformers. I probably would've preferred a TV show, truth be told. I could watch bits and pieces of it without dropping money.
*--For behavior unbecoming anyone, perpetrated in real time over an extended--AH, FUCK IT! MORE MALIBU, BITCHES!!