The basic grade of a paper derives from its content. The difference between the higher and lower grades here may depend on issues such as presentation. Evident, understandable, appropriate for thesis. Excellent transitions from point to point. Paragraphs support solid topic sentences.
Examples support mini-thesis and fit within paragraph.
Excellent integration of quoted material into sentences. Promising, but may be slightly unclear, or lacking in insight or originality. May have a few unclear transitions, or a few paragraphs without strong topic sentences. Examples used to support most points. Some evidence does not support point, or may appear where inappropriate.