Spoiler space however for the climactic part:
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This is a moment the DC universe missed.
They could have had Jack Nicolson reprise his Joker, and found digital standins for Heath Ledger's version along with Michael Keaton, etc.
But they didn't really have vision -- Marvel seems to have moved from "slightly serious / slightly funny" to "we have a multiverse, lets run with it".
I'm no Spiderman fan, and have no real interest in seeing his movies -- but this one, bringing back the Sam Raimi Doc Ock has got me hyped.