I'm coming to you from the Heartland™, Ohio, USA. I've been watching the Star Trek since, oh, 1974 or so. My favorite series is Deep Space Nine, as you might have guessed from my login. The best of the movies Star Trek VI: The Undiscovered Country, with Star Trek: First Contact right behind.
I don't know what else to put up here so I'll do the list thing like a lot of people do.
Best episodes, Worst episodes, quotes, minor characters (per series)Edit
Best: "The Doomsday Machine" It's a classic- but aren't they all?
Worst: "The Alternative Factor" Drek.
Favorite Quote: Uhura: "Sorry, neither!"
Favorite Minor Character: Harcourt Fenton Mudd
Least Favorite Minor Character: Yarnek, that insufferable rock thing.
Best: "Data's Day" Don't ask me why.
Worst: For sheer discomfort, I've got to go with "Justice".
Favorite Quote: Worf: "Nice house."
Favorite Minor Character: Miles O'Brien
Least Favorite Minor Character: All TNG children, including what's-his-name.
Worst: "Profit and Lace" Screechingly bad.
Favorite Quote: Eddington: "Everybody should want to be in the Federation. Nobody leaves paradise. In some ways you're even worse than the Borg. At least they tell you about their plans for assimilation. You assimilate people and they don't even know it."
Favorite Minor Character: Elim Garak
Least Favorite Minor Character: Vedek Bareil, who looks like he invented the Bajoran internet.
Best: "Body and Soul", or anything with The Doctor and Seven. They should have spun them off into a sitcom.
Worst: "Threshold" That's an easy one.
Favorite Quote: Janeway: "There's coffee in that nebula!"
Favorite Minor Character: Seska
Least Favorite Minor Character: Icheb
Worst: All of season 3
Favorite Quote: I can't think of one.
Favorite Minor Character: Vulcan Ambassador V'Lar
Least Favorite Minor Character: Those things from season 3.