Well, spelling and other grammar areas should be checked. Whenever I speak of bad grammar turning away potential readers it is from a majority of what I call "Quick-Typers" that zoom through at 100 wpm without reading what they write, and can typically leave a sentence that doesn't make sense, or even a paragraph that doesn't.

My blog is surrounding the blogging community that typically is ran by a single person, and can share their personal lives or ideals. This is also the crowd that finds little time to proof read what they have written, and therefor miss the idea of their post entirely. The three points I listed can also be thrown against "Wanna-Be" big stars that just throw a bunch of junk keyword targeted on their blog that does not catch anyones eye.