Isn’t there a thread about why ROTJ is the best Star Wars movie? If that thread can exist, this one can too.
I think The Last Jedi is the most ambitious Star Wars movie yet. It makes cogent arguments for and against the existence of the Jedi, it truly widens the scope of the universe to include the perspective of the very rich and communicates their opportunism and human trafficking, it deftly upends the First Order and places Kylo on the throne in a way that is thematically satisfying, and it gives Rey, Poe and Finn arcs that genuinely move their stories forward.
It’s also the most visually striking of the numbered episodes with the most jaw-dropping Star Wars sequence ever put to screen.