I've liked some of the Mpreg stories I've read. Things That Change was one of them. :D It all depends on how they're written though. I don't really like "shmoopy" stories in general, so I don't like those that are like that. But I really like those Mpreg that are written well and have good characterisation (but I guess that would go for all fic I read...). Also, I love those that have some smart magic in it. Not just the whole "You're a wizard, so you can get pregnant. Ooops, didn't you know?" And Mpreg can make a good crack!fic as well. ;)