Personally speaking, old reviews are perfectly fine, as long as you realize they're from 2006, or 2002, or whenever. You have to realize when they say "Best card" or whatever, it's in that time frame.
However, if they benchmark it against other cards, it can and will still give you an idea of the card's capabilities vs a 6800, or a 7600, or whatever they had at the time to benchmark it.
If you are unfamiliar with the card you're looking up (say, a 7200), this can be quite helpful in placing it in a hierarchy.
I find that kind of thing much better than the "roundups" or "top X cards" lists, as that kind of info doesn't deteriorate with age.