The grammar is relatively unexciting, with all morphology happening through affixing affixes (mostly suffixes) and no apophony or consonant mutation or anything not unrealistic, just kind of uninteresting.

(That many/most established Klingon names don't fit into this phonology is addressed later (in the Other Kinds of Words chapter for some reason) as being a consequence of non-Klingons mispronouncing them, which is at least better than not addressing it at all.) My only real complaint here is the spelling: there are five vowels, /ɑ, ɛ, ɪ, o, u/, written ⟨a, e, I, o, u⟩-why ⟨I⟩ and not ⟨i⟩? Why is /ɣ/ ⟨gh⟩ and not ⟨g⟩ (there is no /ɡ/)? /ɖ/ being ⟨D⟩ rather than ⟨d⟩ (there is no /d/) is defensible, I guess, but /ŋ/ should have been ⟨N⟩ rather than ⟨ng⟩ if you're coming up with a writing system for a language in 1985 or 1992 or 2285 or 2368, there's no good reason not to make it phonemic.

χ/), but as ⟨gh⟩ is described as the voiced equivalent and certainly represents /ɣ/ and not /ʁ/, ⟨H⟩ is certainly /x/. ⟨H⟩ is described as like the ch in Bach (i.e. The book very reasonably starts with a chapter on phonology, and while Okrand obviously doesn't use the IPA he describes the sounds of the language quite precisely, with no unresolvable ambiguities and only a few instances of sloppiness-e.g. I first bought and read this book when I was in middle school in possibly 1997, but my grasp on linguistics is a bit better now than it was when I was 11 so I figured it was worth revisiting.

The Klingon Dictionary by Marc Okrand