The last season was 100% rooted in nostalgia and member-berries. And sure, it was fun to see the old cast and ship... as long as your brain has an off-switch.
It was fun to see the cast. The ship? Meh. We called the "big reveal" minutes before it happened without any spoilers. The writing was that obvious. I say this as someone who LOVED the Enterprise-D -- still my favorite ship -- that scene had zero emotional weight for us because it was such an obvious/desperate member-berry. Then to see that ship, which moved like, well, a ship (first few seconds of the clip), fly like an F-16 because some idiot thought Star Trek needed to crib from Return of the Jedi. Sigh.
I'll give New Trek props for production values, the bridge looked AMAZING, but the priorities of the production team are all wrong. All you need to know, they spent three months and a small fortune to recreate the set, then had less than two days to complete the shoot before tearing it back down. New Trek is all form and no substance. Here's a shiny thing to distract you from the horrible writing, just turn your brain off and keep giving our streaming service your money.
The sole saving grace to S3 was seeing the cast back together. The conference room scene on the Titan and the poker game at the end. That's it. The story was throughly forgettable. None of the characters (except perhaps Worf) were written correctly. It copied all the bad tropes -- character deaths for shock value, wanton violence, pointless cliffhangers immediately resolved, and mystery box writing -- that made Discovery all but unwatchable. You ultimately could have told the same overarching story (Changelings and Borg team up to take revenge; the old crew unites to stop them) with a solid movie rather than a ten hour faux-miniseries. Image this same team making Wrath of Khan. It'd be ten hours long, you wouldn't met Khan until Hour 8.5, then it'd be neatly wrapped up in 45 minutes.