The plot leaks were confirmed back when first real trailer released in August. Each subsequent trailer, clip, commercial etc has only further confirmed their authenticity.
So far "impressions" seem to be a mixture of mostly good to amazing, with a few outliers saying it's mixed. Not many overtly negative tweets yet, which should come as no surprise. Last Jedi also received overwhelmingly positive impressions from social media. But once the general public started seeing it, its reception plummeted. Don't trust early previews from social media personalities. This is par for the course these days. The Aladdin, Dumbo and Lion King live action remakes also got positive praise in pre-release impressions on social media. Same situation with the Ghostbusters reboot. The most charitable and naive explanation would be that there's a huge disconnect between these social media people and the general public over what they think makes a good movie. The less charitable but much more likely explanation is that there's some paid propaganda going on here.
There are a small handful of details in the leaks I do think were good ideas, but a lot of the movie sounds like a big mess. The only bit of hope is that there are parts of the leaks that (while stupid and bad) sound like they at least have the potential to be more "entertaining" to watch than Last Jedi (Last Jedi on top of being a bad movie was also an utter bore, if I sit through a bad and stupid movie, it should at least be entertainingly bad and stupid). But I think that when the dust settles, Rise of Skywalker will settle into the mixed but mostly "meh" category. Has the potential to be better than Last Jedi at least, but from my perspective that definitely isn't really saying much.