I cannont stand Old Navy jeans - mainly because after one wash, even if I hang dry them (which I do with all of my jeans), they turn out funky and just don't fit right anymore!
This hasn't been my experience at all. I LOVE the Old Navy Sweetheart Jeans. And I'm happy that they consistently fit me. I've had them in 10, 8 and now 6.
I just ran across this write up too - scroll down to the "Stuff I Love" 1/26 entry. Talks about the jeans and how there are different cuts/fits for different shapes.
I've also had good luck with jeans from Banana Republic. A bit pricey, even on sale, but if you figure out cost per wear then you get your money's worth.