Well, this is sure to start some flaming, but IMO, Fender hasn't gone through any good years, except for some 1966 and earlier (CBS took over in 1965, but Leo continued to consult and build for the company through 1966). Some of the Fender basses that have come out in 2000 and after are not bad, since the subtle upgrades they made are huge!
But, as for other Fenders, they're very individual. Some people like them, and within each year, there are good ones and bad ones. I think that with CBS, the biggest problem was lack of consistency. You'll find people on this board (like Brad Johnson, who seems to only turn things into gold) that have found great deals on early 1970's Fenders. But, for the most part, they're not really "vintage", but sellers are trying to inflate the value of these basses.
Are some of these basses good? Well, I wouldn't spend the money on one, ESPECIALLY sight unseen and unplayed! But, you never know...it may be a real gem-in-the-rough