I agree the CGI is pretty poor, and bad decisions were made to use it for the creature as an 'advancement' over the puppety of the second film.
But... David Fincher is an outstanding visionary (his film was subject to endless tampering by worried studio heads), and against the odds most of the film works very well indeed, crafting an atmosphere and enchantment only dreamed of by other recent sci-fi film makers.
The decision to proceed with a script that laid to rest just about all of the hope left over from Aliens was a bold one, and the director at least gave it his all in providing a cold, generally negative and definitely anti-Hollywood mega budget action horror from a red, red hot franchise which might still yet turn into a five or six part pain in the arse.
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