Diary comics are pretty popular nowadays, especially compared to the past (when they didn't exist at all!), but for the most part I don't really get them.
Well, that's not true. I "get them" in the sense that I understand one of the major reasons that people make them: it causes you to draw every day. And if you want to get good at anything, then you really do need to do it every day.
However, for the most part diary comics don't do much for me, and this is because most people's lives are kind of...boring. I mean, we complain about people posting pictures of the food they ate on facebook or twitter or whatever, so why should making a comic where "I went to a restaurant" is a major event (and yet no additional information is supplied)?
Artwise these comics don't do that much for me, but I think that's probably because they're made without any real planning. The borders are all shaky and hand drawn, and some of the panels are just whatever space is left on the page.
Of course, some people really enjoy reading diary comics. I guess they enjoy the view into someone else's day to day life, but I think I mostly find them kind of boring. But hell, it's not like if I made them they'd be any better (Saturday: Ate cake for breakfast, went to a thrift store with a friend, bought a kinda janky chest of drawers for $5, went to another friend's house to play Unexploded Cow and watch Striptease Samurai Squadron).