Saw it on Friday night (after a 2hrs line-up outside the theatre) and all I can say it, it's the best movie I've seen in the past few years. In no way it is directly comparable to the old Bond movies since everything is so different.
Overall, it's a much darker Bond and Daniel Craig did a good job. Should be interesting to see what the next Bond movie will be like when it comes out 2 years from now. I heard there'll be a cameo by Eva Green
For the DBS roll, apparently they tried to use a ramp to roll the car but the aston pretty much leveled itself in mid air and landed on 4 wheels. So they ended up using an air canon. There was a documentary on Making of Casino Royale on ITV or channel 5.