He finds Carter's philology "clearly inexpert" where not "demonstrably inaccurate," and suspected that the book was "rushed into print to take advantage of the current Tolkien mania." Nicholas Whyte comments on the 2003 update that Roberts "sensibly" did not try too hard to remedy the book's failings, adding a Silmarillion chapter and a bit on recent fantasy.
The reviewer thinks Carter's philology is clearly untrained, either not accurate or deliberately wrong, and suspects the book was rushed into print to profit from the current Tolkien craze. A commentator from 2003 notes that Roberts sensibly didn't try too hard to fix the book's flaws, adding a new chapter about The Silmarillion and some recent fantasy.