Terra Nova was never well written. But as dumb eye candy went it started out well and ended well. Unfortunately it had a lot of garbage in the middle, and several fundamental problems throughout.
Ultimately it all boils down to the main family. Everyone complained about the teen angst angle, but neither of the kids ever bugged me half as much as their horribly boring parents. Even aside from how they came off on screen, at the most simplistic level it became apparent that the story being told wasn't about any of them.
It was about Stephen Lang. And he was by far the best part of the show (CGI dinosaurs excepted, possibly, in the eyes of this huge dinosaur nerd). Every time the show tried to shoehorn one of the Shannons into the action it felt really forced, especially the dad, who we were so often told was the main character. But other than being an ex-cop, he never seemed to do much of anything that made him special. Stephen Lang put his ass on the line and made a mortal enemy of his own son for the sake of the colony. The spotlight really should have been his and every time it wasn't, it made me hate the Shannons just a little bit more.
Even still, if the show had maintained the level of production it had in its pilot, I would be sad to see it canceled now. But I suppose that would be impossible for a TV budget. Apparently it was, since after the first couple episodes, the dinosaurs started appearing only in establishing shots and we got bogged down with amnesia virus and murder mystery plots, stories that utilized nothing special about the show's premise. I guess they were saving their money for the last episode. Unfortunately for them, the rest of the audience wasn't as patient as I was, I guess. Oh well.