I first watched 0083 years ago, probably around the time of its release, which makes it my first Gundam series now that I think about it. As a standalone series I think it's pretty decent, but as I rewatched it I can easily tell it was meant to fill out the gaps between 0079 and Zeta. For that reason the plot could've easily suffered since it is the bridge between one long series to another, much like how the middle installment of a trilogy feels awkward without a solid beginning or end, however they still were able to pull off a good show. It's interesting to follow Operation Stardust as it unfolds, as well as the characters' attempts to stop it.
My only real complaint about the series is the love triangle between Kou, Nina, and Gato. It's introduced so late in that it seems they decided to throw it in there at the last minute, particularly since Nina didn't recognize Gato when he stole Unit 02, so it gave the impression he means nothing to her. Even after Kou and Gato fought several times, she still didn't seem to give a shit until about episode 10 or so, more than halfway through the show. Unlike Lalah, Char, and Amuro, it doesn't really add much to the plot. Yeah, she helps Gato in the end, but that could've easily been written out and still have him do his kamikaze final attack. The whole situation felt somewhat forced. I also am trying to imagine Gato in a romantic situation with his never-ending furrowed eyebrows as if he's in the midst of an intense dump. Actually, that would be the funniest thing in the world. If they had showed flashbacks of Gato and Nina's dates with him looking completely pissed as he usually does whilst he's sprouting sweet nothings, I would completely forgive the writers for everything.