In my opinion, there are 3 types of reality shows: competition reality shows like The Amazing Race and I Survived a Japanese Game Show (most of the reality shows I like are in this category), shows that follow people's everyday lives such as Jon and Kate Plus Eight and The Girls Next Door (I think these are boring and pointless), and "drama" reality shows such as those VH1 shows with the word "love" somewhere in the title (I absolutely hate most of these). Wife Swap falls into the "drama" category, but it's actually watchable. The premise is that mothers from two American families who are almost completely different in a certain respect trade places for two weeks. In the first week, the wives have to follow the new family's rules, but during the second week, they impose their own rules. I like this show, but I wouldn't say I love it. I won't go out of my way to watch it, but I'll watch it if it's on.
When ABC produced this show, FOX produced an almost identical show called Trading Spouses, which I think is slightly better.