I occasionally tune into "Judge Judy" when I am in the mood for some kind of guilty pleasure. One thing that gives me a lot of enjoyment is seeing someone who is really guilty and/or stupid getting their just desserts, and quite often the show has someone like that feeling Judge Judy's wraith.
But I don't watch the show all the time. If I watch the show repeatedly over a short period of time, some things start to bother me. As others have pointed out, Judge Judy can be hostile towards even the most innocent people. And even when people try to be polite, they can get a hostile response. For example, I've seen many times when people politely put up their hand when someone else is speaking, only to have Judge Judy shriek at them, "PUT YOUR HAND DOWN!"
I do know that participants of "Judge Judy" must know what to expect when they agree to do the show... but still a lot of Judge Judy's attitude towards them seems unfair.
Worth watching a few times, and the show definitely has a large audience, going on for over 15 years. Still, the show can sometimes leave a bad taste in your mouth.