Hammer Studios is one of my particularly favourite movie subjects (i'm a bit of a geek when it comes to useless knowledge on those movies ) So I absolutely adore the Christopher Lee Dracula films. With the exception of the latter few (Satanic rites and Dracula Ad 1972) I think they're all great. You're right in some respects regarding the charm and nostalgia factor, but I genuinely think given the budget and time restrictions that people like Terence Fisher (one of my favourite directors from that era) had to work under they produced miracles.
I have a soft spot for the Frank Langella's Dracula too. It's a pretty poor version (with a terrible performance from Laurence Olivier) but Langella was great and should have had much more screen time.
As for earlier versions of Dracula, I think Nosferatu (1922) knocks the Bela Lugosi version for six. Max Schreck was a seriously impressive vampire, and the photography used in that movie (considering when it was made) was nothing short of astonishing. The use of negative film on the trees etc, was wonderfully creative.