I feel that TOS, TAS, and the TOS movies, and certain books and RPGs are real Trek. TNG, TNG movies, and certain books are inferior Trek with better graphics. DS9 started moving back towards real, good Trek. Voyager had a lot of good ideas and pissed away too much potential. Galaxy Quest is an alternate universe of TOS - and the best Trek movie ever!!! I don't count ANY video games.
Enterprise was a reboot that had potential, but had too many issues for me to embrace, and the nuTrek movie was yet another reboot. Character and dialogue were spot-on, but there was no coherent plot, too much nonsense, and too much inanity for the sake of humor.
The above describes what I go by when I write fanfic or run an RPG.