I just got back from watching it again, my third and last viewing.
My girlfriend loved it again.
I still like the film a lot. It's true that the final battle and even the last duel were quick, but I didn't mind it at all. I kind of enjoyed seeing the villains crapping their pants after what they did to House Atreides in the first film.
Seeing the Atreides flag fly in battle was pretty cool. Even Brolin's fight against Batista was quick but satisfying. A complete slaughter all around. I even like how the Fremen were burning all the Harkonnes bodies just like the Harkonness burned the Atreides in the beginning of the film.
Where I think the film slowed down a bit much was when Brolin shows up, then they go looking for the bombs, and Paul drinks the water of life. Basically, the leadup to the final battle was a bit slow. Still, I got chills after Paul "came back to life" and ascended to Lisan Al Gaib. The speech scene was good too. The actor did a fantastic job. The whole cast really.
Austin Butler, Javier Bardem, and Rebecca Ferguson are the standouts for me.
Weakest actor was Zendaya, imo. The whole film she looks like this
I still consider this film the LOTR of sci-fi films. Maybe not as good as LOTR, but up it's up there.