I agree there were definitely good moments-- good lines included to honor or acknowledge highlights of previous episodes (you all have provided prime examples). But, for example, there was also at least one scene where he said effectively "Moriarty was wrong. There was another person who mattered. The person he thought mattered the least was actually the one that mattered the most. That person was you, Molly Hooper." That's practically the same thing as what he said in TRF, and there were other scenes (I need to rewatch) where it's just basically the same conversation or set of lines all over again. One liners are awesome, but I wasn't so happy with entire conversations or monologues being used almost verbatim.
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"You're looking for the secret... but you won't find it, because of course you're not really looking. You don't really want to know. You want to be fooled. But you wouldn't clap yet. Because making something disappear isn't enough; you have to bring it back." -- The Prestige
"Just one more thing, one more thing, one more miracle, Sherlock, for me, don’t be … dead. Would you do that just for me?" -- John (s2e3)