A decent guage is how car dealers feel about them -- how much they have to spend to recondition the typical lease return or auction purchase. I've heard Saabs are pretty good in this respect. I've also heard they're tremendous money makers, because they can be bought for next to nothing at auction, and sold right alongside more expensive cars for healthy profits.
Keep in mind these are 2-5 year old cars with well under 100k. Most modern cars will do that with no problems anyway. There's little telling about long term reliability, but among the owners I've known, their Saabs have been pretty good. OTOH, these used Saabs are so cheap that for the same money you can often get a younger one, vs. another make.
FWIW, the latest 9-3 is a fantastic car, way better than previous 9-3/900, even if it's lost some character. If the current depreciation curves hold over, it will be the best used car bargain ever!
Matt O.