I like hearing what people pick out as their favorites in these. My favorite part of the Act II cinematic is when Leah takes Tyrael's hand. For some reason, seeing the size difference just makes me chuckle…and then shudder a little at the thought of being hit with something like that. Definitely don’t want to make enemies with Wisdom.
My favorite cinematic is the act 4 one when Leah/Leahblo fights Imperius. The build-up was so good and the artistry in the cinematic with the swaying hair and the voice-acting was magnificent. My only complaint is it felt too short. Imperius, Heaven's most celebrated and proven warrior, basically got tossed around in the matter of seconds by Leahblo. Other than that, it was great.
Leahbro was all seven prime evils in one so it sort of makes sense.
I love Diablo3 and when I can play just act4 and clear it with more ease than I do currently I'll be very very happy.
Edit: Also, I love the story and all the cinematics. Simply awesome.
Spoiler: I also loving whenever you hear Adria speak and I rephrase everything she says in a sweet matter of fact tone that fits her motherly facade oh so well.
"Adria, what do you plan to do with the Black Soul Stone once Belial and Azmodan are trapped within?"
(Sweetly) "It's simple, I plan to turn Leah, my only daughter into Diablo, the Lord of Terror and unleash her on the High Heavens in an attempt to destroy ALLLL creation."