great question. From my experience the greater risk is "getting lost in listing". Since you're expected to summarise research done in a certain field, the first impulse is to include everything and make sure and not to forget anything. While this is fair enough I think it is indispensable to "tell a story". A good review article should tell the readers where we started, and inform about developments, variations, (dead ends?) and open questions. In short: the reader should learn where we are and how we got there.