The new temple is fun, being able to fight one of those shrine monks to some funky music was cool, you get a goddamn motorcycle and most importantly they gave more information on the four champions, though it would've been nice if there was a little more than a diary and a cutscene thats like a couple minutes long.
I think it would've helped if they added a new area so you're not just treading familiar spots (Or familiar bosses, for that matter). Definitely could've benefited from some more sidequests as well.
Overall though, it was nice having a reason to jump back into botw since I finished just about everything in the main game. My expectations were probably a little too high but it still left a lot to be desired.