I'm currently working my way through Eruption. So far, (1/2 way through), it's OK... but not great.
By way of contrast, every single one of Michael Crichton's novels authored exclusively by him have been far, far more engaging.
For me, Eruption is a James Patterson novel based on some notes/a rough draft from Michael Crichton.
And this is in marked contrast to Pirate Latitudes - a posthumous Crichton book credited only to Michael and, presumably, a product only of Michael's writings (plus whatever, presumably small, changes an editor might have made);
and to a much lesser extent Micro, a novel based primarily on Michael's writings but finished by Richard Preston.
Crichton, IMO, is a far better writer than either Patterson or Preston, and the posthumous works finished by these authors are markedly less engaging than works authored solely by Crichton.