With the old films it was meant to be, implausibly, the same man from Connery to Brosnan hence him knowing about various gadgets kept in Qs vault from previous films, use of the DB5 and knowing the previous M before Judy Dench.
No matter how you want to link Daniel Craig with the previous films its not possible, its a new universe with a revised version of the characters. Trying to fit them into the previous series would be like trying to fit The Dark Knight in between Batman Returns and Batman Forever.
Skyfall was a good film, a really good film. Time will tell where it really fits in terms of being the best Bond film or top 3, 5, 10 etc.