Jurassic park was a great movie, but the book itself was leaps and bounds better. Sphere was awful as a film, I did not read the book, though.
Paul Walker is arguably a worse actor than Keanu Reeves, the choice of putting him in a leading role gives away exactly who the producers are planning to cater to: the Fast and the Furious crowd. Forget a compelling plot or interesting scientific explanations. This film is going to be about explosions and swordfights. I will be happy if my hunch turns out to be false, though.