I generally enjoy Nolan movies for the intricacy of the plot structure that his movies typically have, whether it’s the rules of the dreamscape in Inception, the deconstruction of Batman, the non-linear narratives of Dunkirk and Memento, etc. Patrick Willems did a YouTube video describing Tenet as a vibe movie - it was all style and little substance by design, and ultimately it suffered for it. While Nolan’s movies can be pretty cold, they usually try to explain their conceit and if you like that stuff, you enjoy the complexity and his ability to still tell a story within that.
I think where Nolan is a bit overrated for me are his action scenes. I find them somewhat lifeless in their execution, which is kind of interesting in the sense that a lot of his movies can be considered action movies (Batman, Inception, Tenet). But the action is less about the actual stunt work or fight choreography and it’s really about the payoff to narrative tension that he’s built up. Batman’s fights with Bane, for instance, are pretty standard, straightforward fights without a lot of flash that we’d might expect in a movie about a superhero/ninja/fighting machine. But I think we kind of forgive that because Nolan does a great job building up to those moments of action, rather than being a great action director.
All in all, the guy’s movies are must watch, appointment viewing for me. He’s one of the few big directors doing original movies these days, and even if his style is kind of cold, it’s still unique to him.