If you have read the book don't bother. All the tough strong women in Crichton's book have been turned into men, Billy Connelly should be left in that sentry as as for Anna Friel and David Thewlis' accents Yikes. You guessed it I hated it
I watched it after reading the book - it's fascinating to see if it matches your mental vision.
The top cast had to work with a simplistic script and excellent Anna Friel, in particular, lost out when the book's machiavellian Lady Claire was transformed into the film's sensible sweet girlie and David Thewlis wasn't allowed to be quite the corporate scumbag that he should have been. At least Gerard Butler's character retained his swashbuckling style.
Having said that, it's a full-on action film which doesn't stop to let you get your breath until it's over.