Very good for the most part, bad in small parts, slightly wrong in other small parts.
First up: Daniel Craig, Judi Dench and Javier Bardem are all proper actors. Put any two of them in a room with a decent script and the proper lighting and you get a real properly acted scene. There are a few of those. Javier Bardem is a great Bond villain, and I still maintain that Daniel Craig and Judi Dench are brilliant as Bond and M: the history, the friction, the affection, it's all there. Motorbike chase over rooftops? - check. Exploding tube trains (and MI6 headquarters)? - check. Big set piece at the end? They blew up part of the set of Harry Potter* - question mark.
It's the 50th anniversary of Dr. No, so there were a lot of retrospective jokes about "is it time to take a desk job?", "the world of espionage is so hi-tech today, I can do more damage with my laptop in ten minutes than you can do with your gun in an hour", that sort of thing. A couple of references would have been enough, it dragged on far too much and got in the way of the story. The original Aston Martin DB5 made an appearance. Oh, baby...
I think Sam Mendes was trying to remake Moonraker or Live and Let Die, one of the big Roger Moore epics. That is not the Bond that Daniel Craig is: he's an actor, a Bond who uses his fists, who can get injured, who has his loyalties tested and his reputation besmirched and has to recover them. That is where a Daniel Craig Bond movie should be pitched, not "Hey! Let's blow some more shit up! It will cover up the lack of acting! Or Story!"
Naomie Harris is the new Moneypenny. She is spot on, and the back-story fits with the flirting and the history. She gives Bond a shave: this scene is more genuinely sensual than any in-the-sack scene in any Bond movie. Seriously. Also, she's a babe - schu-wing!!!
Bérénice Marlohe as Sévérine on the other hand... She looks like she got dressed in the dark and got me to put her make-up on. When I was drunk. She does not develop as a character, and then she dies in a haphazard and meaningless manner. That's back to the '70's mysogynistic attitude that Bond movies used to have. Kill her like you mean it, if you have to kill her.
Overall, I liked it, but I suspect Barbara Broccoli lacks the instincts that her dad had in spades. He really knew what he wanted from a Bond movie - I think she's thinking too much about legacy and maintaining the brand, and not enough about reinventing the brand and making the best movies she could.*spoiler alert! Skyfall is the name of the house in the middle of Glencoe in the Scottish Highlands where Bond's parents lived and where he grew up until he was orphaned. The big set piece was blowing it up / burning it down. This was actually presented in a fairly realistic and not completely fantastical way. While I applaud that, does realism really belong in a Bond Movie?