I've heard this scene get complaints all the time, but it's not even a very long scene. It's a solid scene for that matter. Zero is definitely slower than UBW, and I'd pose that's effectively why it's better. It gave the action more weight and made the characters more interesting since they took time to develop.
Heavens feel did have some "if you want to know what we're talking about, go watch UBW" parts. Hint: don't, it won't explain much.
Otherwise, I did overall like the movie