Gundam NT takes place a year after the ending of Gundam Unicorn. And let me remind you that Unicorn was a very perplexed and heavy story, with a tone of references and fan service to Universal Century stories. It had great fights, interesting mecha designs and decent to shallow characters.
In Gundam NT we have a tone of references, a lot of fan service to UC, some great fights, ridiculous overpowered mechas (although I loved "Phoenix") and decent to shallow characters, in a story incredibly thin.
It can be watched alone, too, but the best way to watch it, is as an aftermath movie to Unicorn. And then forget both of them and move on.
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