Define a "good" MC?
Everyone has different tastes... Instead of him expending his vocab (which seems fine), you could try and expend your vocabular tolerance. Same result, but would also add a little personal growth.
And as mentioned, in the context of keyboard commandos - swearing plays a part. Let us also remember that rap begun in black/miscegenatist ghettos, strong and vivid language is part of that whole subculture.
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