Yes, the faster framerate took some getting used to. Yes, it made some scenes look fake. Yes, in particular the CG, such as the eagles. Yes, it also made lots of stuff look really cool.
Yes, the singing was awesome, particularly since it established the dwarves' leitmotif very effectively, which made the rest of the times it appeared much more recognizable, and thus it was easy to feel the "FUCK YEAH DWARVES" feeling when the music showed up. The musical callbacks to the LotR movies were awesome too, such as the Shire theme, the Rivendell theme, the eagles theme, the One Ring theme, etc. Although I noticed they seemed to have used the Nazgul theme when Thorin advanced towards Azog, which was weird. Still awesome though. Also, when the elves came to rescue everyone from the warg attack, I mistook the music for the Rohan theme. I was all like "FUCK YEAH ROHIRRIM oh wait..."
Yes, the movie dragged a bit. For example, did we really need to have Bilbo fall off the cliff? And then Thorin falling down after him? Did that add anything to the movie? We already know they're in peril, the ten minutes prior already established that, what with the fighting giants and all. I actually feel like they could've cut a lot of Radagast's stuff, and maybe a few chunks of the goblins.
Yes, this movie was lighter in tone than the LotR movies. I actually thought parts of it would work as a kids' film. Well, apart from all the decapitations.
Yes, there was a Wilheim Scream. I actually thought there were two, but the first one I wasn't 100% sure about. The second one, from a goblin, was definitely it though.