I like this show. Even though I was born during it's first season, and I've only seen season 4 and am working on the season 3 DVD set, I find that I watch it every time there's nothing else on. It has some great lessons in it, even though it seems to focus more on the character's lives than the actual cases they work on.
I find watching Johnny Depp during his younger years very interesting. You can even pick out some of his acting gestures that you can find in his latest movies. I'll keep watching this show over and over until I get sick of it!