I'm just going to cut straight to the, aha,
cut, behind which I flail ridiculously rather a lot because OH, HEARTS.
Personally, I thought the bouncy-bouncy (and the music) and general EPIC BROMANCE was similar to the 2009 Sherlock Holmes film (which you may have noticed me adoring beyond all telling) and I am fully in approval of this.
I also approve greatly of the visual quirks; the door-as-scene-cut and floating text are just two that spring immediately to mind.
Apart from that, I loved whole swathes of the entire 90 minutes, and I loved how witty and clever it was, and I found the conversation between Sherlock and John in the restaurant to be absolutely adorkable--
soupytwist called it 100% accurately on twitter when she referred to Sherlock as a gay alien *asexual* because he really, really is--and thought the canon references (three patch problem! Mrs Hudson and her "I'm your landlady, not your housekeeper!" refrain) were awesome and hi, hello, HI--
Mark Gatiss went and wrote himself the part of Mycroft and it was glorious. The final meeting when it's revealed that he is Mycroft (I'm guessing the writers were hoping that the earlier scenes with John being kind of kidnapped were supposed to nudge people into wondering if Mark Gatiss wasn't supposed to be Moriarty) is EPIC and, oh, poor John and his little FACE and his indignant "Who's Mummy?" and flail and so on.
In conclusion, my utterly favourite part was when Sherlock (with his blanket. For shock) is grandly starting his deductions on who shot the bullet for Lestrade and in the middle of '...military service' he catches sight of John hanging around near the cars, looking kind of curious and kind of sheepish and kind of worried and he just STOPS and the expression on his LITTLE FACE is just-- oh. BOYS *HEARTS*