I think I just have a true appreciation for creativity. Due to the fact that I'm constantly thinking about things and making things myself, I can tell when something someone else made took a great deal of time, effort, and/or genius. Invader Zim is hilarious, and has tons of subtle humor. Angry Beavers, too, has some good stuff. Looney Tunes has some, but its humor is more outright. It's amazing how much an appreciation of what the creators did to make the show can make you like it. . . I mean, I'd like them either way, but knowing what they went through to think of it sometimes amazes me, and I like it all the more.
Family Guy is a funny show, too. I'm not sure if anyone mentioned it yet, but it's got some good subtle humor, too, and whoever makes it is really good.