I live in NYC and whenever someone from out of town visits, I usually take them to a taping if they are interested (and they usually are).
Live with Kelly - Can't stand her, but she interacted with the audience during nearly every break, so she gets an A+ from me now. Since it is live, we were in and out quickly.
Letterman - It was freezing because Dave liked to keep it like a meat locker in the theater. During breaks he took off his jacket to cool off from the hot studio lights. Dan Rather was a guest. I had never noticed his drawl until then (he kept it more under wraps when he was on the "CBS Evening News). Nothing too exciting.
Dr. Oz - Even though he seems like a quack these days, he was very efficient and rarely had to do retakes. Another show that we were in and out of quickly.
Jimmy Fallon's 1st Show (Was it the "Late Show?") - The first time I went was early on when he had started the show and he was eager to please the producers and the audience. The second time (a year or two in), he looked bored/blase and like he wanted out of there (plus his eyes were really blood shot). Soon after that he was selected for the "Tonight Show."
Match Game - No one was funny or gave interesting answers. In the spirit of the original "Match Game," none of them were stars, but they also didn't have any personality. A real dud.
Joan Rivers - My first show taping. Joan interacted with the audience during every break. I had always thought she was a really mean person until I saw her during this taping.
The View - Pretty boring because none of them spoke with the audience. Also, it was difficult to hear them during the show....the mics were obviously only picking up for the tv equipment, not the studio audience. Most of us had to strain to hear what they were saying.
Price is RIght - My father was sure we'd get picked because we were from a very small town, but nope. The studio (this is back toward the end of Bob Barker's time) was run down/tacky and very small. Toward the end of the taping, it was difficult to get the audience up and acting like we were excited.....because we weren't.
I'm sure there are more, but those are the ones that spring to mind. I've never been to a sitcom taping, but I've never wanted to sit for that long.