Definitely a flawed show, but in the spirit of the post:
Tuvok - while not a super interesting character, I liked seeing a stoic vulcan who wasn't conflicted about who he was.
early Tom Paris - I liked the "we need this somewhat reformed character" angle, as well as his background of being both a failure in Starfleet and the Maquis.
USS Voyager - The ship is great looking, inside and out. TNG's interiors always looked too much like a cruise ship, but Voyager struck a nice balance between being a military ship but being built by a utopian society.
EMH - the Doctor is a great character and Picardo is a hell of an actor.
Viidians - an imaginative way to do an enemy race. Taking people who would otherwise be allies and making them assholes because of a devastating disease is brilliant.
Reginald Barclay - for a show that had trouble developing a good bunch of recurring characters, they did a good job with utilizing Barclay.