As a kid, Moonraker was the only one I actually saw in the theater, as well as repeatedly on cable. At the time, I found it enjoyable, not only for the reasons already mentioned, but also for it's use of more classic gadgets such as the poison darts & pen, as well as the way it pokes fun at the popular sci-fi du jour.
As far as cheesiness goes, my personal favorite would have to be Live And Let Die. This has to be the most '70s of the whole series, with our hero looking totally outclassed by men in nicer suits. There are times when Bond looks justifiably embarrassed every time he realizes he's on the wrong side of a blacksploitation movie minus the foul language. And of course, the styles & trends, such as when he peels off his black jumpsuit to reveal a tacky plaid sportcoat & slacks, or how uncomfortable he looks while trying to enjoy the luxury of a classic bath tray in an uncomfortably shallow modern bathtub. And how many times has The 007 been called "Jim"?