I read in a review that Travolta expressed anxiety over being replaced by virtual actors like in FF. I think by the end of the decade they will be in trouble, but not right now.
The graphics were variable from shot to shot. Some places you can clearly see pointy edges sticking out of the chars, while other shots were superbly done .. looked just like the real thing.
Whoever wrote the script is an idiot. A better choice of dialogue would have done wonders for the movie.