most of their frozen foods are pretty good (if not necessarily good for you). I also like most of their wine.
I'm indifferent towards their meat, produce, and cheese when compared to my local grocery store (granted, my local store is in a pretty high-end neighborhood)... I'll stop by TJ's if I happen to be in the area for something else, but I don't find it to be worth the drive to make a trip out there just for groceries (it's about a 25 minute drive from my house, compared to 5-10 minutes for my local grocery store)