One should never generalize. Tell me what you know. Comparisons are as bad as cliches. Be more or less specific. Understatement is always best and generalizations must always be eliminated.
Exaggeration is a billion times worse than understatement.
Eliminate one-word sentences. Analogies in writing are like feathers on a snake. The passive voice is to be avoided. Even if a mixed metaphor sings, it should be derailed. Each pronoun agrees with their antecedent.