I am playing Shattered Space right now, after starting a new Starfield playthrough from scratch. I am actually impressed by it so far. I would like to think I am halfway through it or so. It starts you on a space station and eventually takes you to a planet with a new town to explore and hand crafted areas. The town is interesting and the surrounding area has really nice points of interest. In my opinion, it is more interesting and well thought out than any single location in the rest of Starfield. I feel like the reviews should be way better than the base game. Overall the quality of the DLC is better than the main game. I hope it stays that way throughout the DLC and doesn't run out of steam like the main story does.
EDIT: Looking at the Steam reviews is even worse. WTF? I am starting to think that no matter what, people think Starfield, and any added content, is pure shit.