The Oankali have strange and disturbing ideas about consent, which makes this an uncomfortable book to read. (This is, like, intentional, though.)

There's a disregard for singular 'they' as a genderless pronoun, instead 'it' is used to refer to the Ooloi; this doesn't feel as bad as it might because it's apparently the pronoun that the Ooloi chose to use for themselves in English

The biggest problem I have with it technically is that not all that much happens for much of the book? At least the first half is spent with Lilith just learning things about the Oankali. Which is interesting, but pretty slow