For the fact that they generate dirty HTML code. It was a good experience to never have used an editor when I first learned HTML. It was purely all tags. Once editors started coming out, and the one that I frequently use is Microsoft Frontpage, the only thing that I find useful in them is creating nested tables. With that, I don’t have to worry about having incomplete ending tags. Other than that, I prefer clean HTML tag creation. These days, I am more into programming than designing, that’s why I don’t these editors. If I was more into designing, then I’d find programs like Macromedia’s Dreamweaver to be pretty useful.