Many James Bond films absolutely make me cringe at how cheesey they are, I used to like them as a child (although I wouldn't really call myself a Bond fan) but as I grew up I started to find Bond to be a bit of a to$$er, the Bond girls to be empty shlls, and the stories to be ridiculous. I know longer found this quirkiness enjoyable but annoying. I really enjoyed Casino Royale though, I found it thrilling and liked the grittier nature of it, so I'll have to say I find that formula about right.
However, I can see that for Bond true Bond fans it may have been changed too dramitically, as if it may aswell be a film featuring a completely different character.