Pretty much the pinnacle of superhero movies for me - i'm drawn in from the moment of the opening to the end credits and have always watched in a single sitting, that said, much harder to watch these days with limited time and a child around most of the waking hours
I've probably watched it 6+ times since it came out, including the 3.5 hour ultimate cut twice.
It's somewhat depressing how much of a mess Snyder made of this subsequent movies, 300 and Watchmen are classics and he should have killed it at DC, instead, he helped kill DC.