I think the biggest issue with "slice of life" type RPs, especially ones where you're playing students, is that is lends itsself far, far far too much to very basic levels of escapism, as opposed to challenging writers to create complex characters with struggles and arcs. 

It's appealing because it's easy, and it's easy because most people on this site are or recently were students. 

I dunno. Just my 2 cents. I think slice of life is a little less writing exercise and a little more writing self-pleasure. Which, hey, if thats what you want, by all means.