Fun, but boy, those embarrassing visual effects, especially...
...the helicopters at the start. Which is a shame as it almost lost me the film. God they were awful. Worryingly the same CGI program (seemingly only capable of working in threes) did the daylight shots too. And the Delta Force attack, screamingly poor. And, er, the Raptors too - mildly better.
More widely, it's interesting that CGI almost always fails on helos, just as with people. Something to do with the nature of the movement.
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