Ok, that was on Phone before I drove home. Back now so I can be more thorough. I'm not gonna bother with spoiler tags, so expect them sprinkled throughout.
Regarding the "video game". I objected strenuously to the Goblintown being described as such because it simply never looked or felt like any video game I've ever played, and I've played a lot. The Smaug attack did. The closest analogy I can give is the droid factory in Attack of the Clones. It felt like a video game set with buckets and chains and moving platforms etc. Also, those of you who had a problem with Frodo and Sam near the lava are gonna have a cow when you see Thorin paddling down a river of molten gold in a wheelbarrow. To crown it all they finish up with yet another physics defying moment. They break apart a cast to reveal a giant golden statue of a Dwarf. Its completely holds its shape for about 10 seconds and the inexplicably melts. In spurts. All over Smaug. Honestly, its ridiculous.
BUT. Thats the worst moment in the entire movie. Unfortunately its pretty much the climax. Everything up to that was good-great. Conversations with Smaug was simply awesome. Better than Riddles for me. V-man, pretty much every line of dialogue from the book is in there in some form or other, often verbatim, but switched around a bit. It all works really really well. The only line missing is the bit where Bilbo mentions Dragons being softer underneath. Its not needed, because we've already heard that Girion had knocked out one of Smaugs scales in the attack on Dale. Bilbo spots it and says something like "Its true, he did lose a scale" or something. Also, sorry V, but the Black Arrow will definitely be fired by Ballista. Its set up completely in this movie.
Other high points. Balin and Thorins reactions when they enter the mountain. Balin in pretty much every scene actually. But its Bilbo's movie. He's simply pitch perfect in every scene. There's a lovely switch in the doorstep scene which I won't spoil unless asked. It works really well. The Ring is given exactly the right weight of simple and sinister. Bilbo is no junkie, but he is affected. Also, the "Stoner Dwarves" are simply soporific and confused. No giggling stoner gags.
Tauriel and Kili. Have to say I loved all of this. Very "human" characters if you'll forgive the irony. This is no love story, shoehorned or not. They're kindred spirits, who make a connection. Its more Aragorn/Éowyn than anything else. Her healing is really nicely done and didn't feel like a LOTR flashback to me except in consistency. Fili sees her in the "other realm" effect that Frodo saw Arwen in during his healing. Now, yeah, I get that Tauriel hasn't been to the blessed realm and Kili isn't turning into a wraith, but it just feels right. Bard's family are great, and Luke Evans is lovely in the role.
Stephen Fry jarred a little for me as his first few lines sounded exactly like Lord Melchett from Blackadder, but he grew on me. Alfrid was fine, not a Wormtongue clone as I feared. Orlando was good, but I think we'll see the payoff of his dourness later. There's a lovely spot in the Barrel Ride where Thorin actually saves Legolas' life without him realising also. Thranduil is pretty much awesome in every scene, and gives Tauriel very good reasons to look outside the kingdom. Screenwriting 101 my ass!
The Dol Guldur stuff is all setup. Payoff on the way in the next movie.