How a person speaks, dresses, acts or smells on his own time is his own business. Poor language skills (oral and written, spelling included), sloppy clothes, rude or unacceptable behavior and poor hygiene are the kiss of death in a legitimate job interview. I have sent many applicants down the road for showing up wearing piercings, talking to me like I was one of their 'Homies' or just plain smelling foul. This does not mean that a well dressed, well groomed, articulate applicant is better... they are the one you catch stealing from you later on.