While the featured English language usage gaffes encountered in Gervase Phinn's Mangled English are indeed and definitely both fun and really entertainingly diverting, I have also often found with the majority of tomes presenting collected tidbits of accidentally and inadvertently funny vocabulary and grammar/stylistic mistakes that these books, that these collections do have the tendency to become more than a bit tedious.
And thus Mangled English of course equally manages unfortunately to wear somewhat thin the more of Gervase Phinn's featured examples one reads, that it simply can and does become somewhat dragging and almost too painfully and gratingly funny to be served a continuous platter, a never ceasing and ending barrage of grammar mistakes, wrong vocabulary usage and mixed metaphors (and that Mangled English is certainly no exception here), which is also the primary reason, I usually and generally tend to read Mangled English and similar such collections in small bits and pieces whenever I need a laugh and/or a pick-me-up (for example, I often peruse the "Student Blooper" sections of such tomes during and in particular after painful and frustrating exam and assignment marking sessions).
Three solid stars for Mangled English and most definitely recommended, but I have and gladly so upvoted Mangled English to four stars. Because yes, I do very much appreciate that unlike for example Richard Lederer with his Anguished English collections, Gervase Phinn never becomes arrogant and holier than thou in Mangled English. And honestly, it certainly feels good to have an author/compiler of error of usage examples not show a boasting and a full of himself/herself text (since author arrogance can and does often ruin books on English language mistakes for me, which in my opinion and happily, Gervase Phinn totally and delightfully avoids with Mangled English).