OK so this is out now so I watched it and I thought it was pretty good!
To highlight the negatives first, the plot is kind of all over the place - it very much feels like about four different draft scripts mashed together. There's also a comedy character that really didn't land for me. Also the ending kind of tries to do the same thing that Bogus Journey did, which was a misstep because Bogus Journey did it so well that this one doesn't work as well.
BUT THE GOOD THINGS are that I did find it actually funny, most of which comes from the four main characters (Bill, Ted, and their daughters). Keanu Reeves and Alex Winter are great and it really does feel like they're the same Bill & Ted but 20 years later. Samara Weaving and Brigette Lundy-Paine were also really good and frankly I could have watched a whole film with them.
But overall I guess although it's not perfect, and probably not as good as the other two, it was just really nice to watch Bill & Ted do things again. Like, they're nice characters. They're good boys. They're just kind to everyone they meet and they just want the best for people. And that's nice to watch again, y'know?