Smooth, various sentence structures and transitions between sentences and paragraphs. Plenty of complex sentences. Paragraphing is organic and unobtrusive. Ideas have some support from the primary source, most of which taken from the obvious places and used in the obvious ways. Virtually impeccable grammar.
Transitions are usually standard ones, and only sometimes smooth, graceful, or interesting.
Paragraphing often stiff or obtrusive, though strictly speaking, unified and coherent. Could be any freshman's paper for all the uniqueness of voice. Competent, but homogenous. No support for ideas, or very little, and usually paraphrase. Regurgitates class discussion with significant muddling.