Instruct: Classify the given review as either positive or negative.
Query: a spuriously reasoned defense of bad usage

Whatever advice you find here that is different from advice you might find in a conventional grammar book is advice you should not follow--if you want to appear reasonably literate to reasonably literate readers, at least. Get hold of a conventional grammar book, say, 'The Elements of Grammar'. Get hold of a good dictionary, an American Heritage first edition (if you can find it). Get hold of Strunk and White's 'The Element of Style'. Get hold of the second edition of Henry Fowler's 'Modern English Usage' (edited by Ernest Gowers). You're set.