It's definitely nice to see so much positivity out there already. Looking at the Starfield Reddit community, a lot of the top posts are praising how much fun the Shattered Space DLC is, with some even going as far as calling it a "must play".
Clearly the vibe is pretty good over on the Starfield Reddit right now, but it's not like there aren't quite a few grumbles to found as well - and that's particularly apparent if you head over to the Starfield page on the Steam store.
In fact, Shattered Space has a "Mixed" rating on there as things stand, and here are some of the more negative reviews:
Enzevil on Steam: "This is sadly not what I expected from Bethesda, and is just more Starfield like the base game. I was hoping they would take more of the feedback into consideration regarding their story, writing, characters and quest design, but sadly it doesn't look great."
Woldelele on Steam: "Nothing substantially new has been added. We just got new quests in a "hand crafted" world-space with more of the same exhausting dialogue, that's it. For $30 dollars, it really isn't worth it, especially if you were looking for something to overhaul or spice up Starfield's core experience."
The big thing to keep in mind about the "Mixed" rating on Steam, though, is that some of the reviews are being submitted about the base game rather than the DLC itself, so it doesn't properly represent the full picture. The two examples above are about the expansion, of course, but in some cases people are downvoting it without even playing.
It's a similar situation on the Xbox Store, although 58% of the reviews on there have given it a 5/5 so far.