Never read the book, my girlfriend did. She enjoyed the movie quite a lot, but was disappointed that a lot of stuff wasn't in the movie. Also, appereantly one of the High Five members is actually murdered in the book. Kinda weird that didn't happen in the movie...
As for me, I enjoyed it. It was entertaining, and as a 80s kid, I loved a lot of the references.
As a fan of the book, I'm still perfectly ok with the need to take liberties in various ways - too much of what made the book work would never look decent on film. But I have to say the High Five are by far the biggest disappointment and a change that certainly isn't for the better. In the book, they're a disparate, disconnected group of people who only happen to share a goal and an enemy and then wind up being forced together, becoming comrades and eventually friends. They weren't the absolute center of the story, but that aspect of getting past the avatar to get to know people for real was definitely integral to the themes of the story. In the movie, they just all show up randomly, instantly clump together and then formlessly morph into a friend/family blob with no real definition or heart. By the end of the movie, Daito and Sho still don't even have the barest hints of a personality.
Yeah... Lifting the Spell of Making from Excalibur was a laugh out loud moment for me, but I must have been in a theater without many John Boorman fans because I was the only one, I think... Even my wife and son didn't get it... But Danny and I both laughed out loud with the Holy Hand Grenade of Antioch.. I only wished they had counted to three...
That really was a missed opportunity. All he had to do was count to three quitely before throwing, it would have been absolutely perfect.
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So I just saw the film. I think overall the book is definitely better. I was hoping Spielberg would once again take a strong story idea and transform it into a classic, but like most of his recent work, this was really just a highly enjoyable popcorn movie that isn't going to last well. I think Wade and Samantha worked well enough and Aech was alright as well. The Halliday actor was actually pretty great. A few of the changes made were definitely for the better (especially the IOI infiltration sequence which is far more organic and believable in the movie) and a few were simply necessary (perfect reenactments were never going to work onscreen in any way - using the reenactment as a 'cover' for the real test was brilliant).
I think the movie did do a better job of bringing out the theme of real people and real lives, primarily just by the visual luxury of being able to show us all those people everywhere fighting together against IOI, and even more importantly, talking and interacting together for real after the cataclysm hit. I also definitely liked seeing more of Art3mis as a more lead character. But in every other aspect, the book just told the story better.
The movie has no sense of time, of the hunt being truly difficult or even of the main characters being uniquely qualified to win, which undermines the idea that no one has ever figured any of this out before. We don't even get to see the opening of the first trial, because some nameless dude who's never mentioned onscreen again figured out the first clue years before the movie started.
The movie also has very little sense of character growth or depth - as I said above regarding the high five - but also in regards to Wade's own development. He says all the right things, but he seems to stay pretty much the same from beginning to end. That whole sense that the book had of him actually learning the importance of the real world is also missing, especially because of his total lack of response to his family's death which should've been the driving point (even moreso since his Aunt in the movie is actually much nicer than his Aunt in the book). And the central relationship is massively rushed with Wade and Samantha meeting each other in person before their relationship ever really even gets started and no real closure at all to her fear of him being a distraction from her important work.
And the ending with Sorrento coming to shoot them in person and then just giving up was utterly bizarre, especially when they did the 80s comedy 'villain's comeupance' thing of him getting smacked for a laugh as he's hauled away.
Also, 'tuesdays and thursdays'... I mean, it's probably a solid policy, or at least the start of one, but it doesn't exactly have the catchiness or profundity necessary for its placement in the movie. Spielberg took a gimme rules tweak and tried to present it like it was the key to changing the whole world.
But, overall, I definitely did enjoy it quite a bit. And I was extremely happy to see that the one sequence I wanted to see most - which was also the one sequence I had already convinced myself they would never be able to get the rights to - actually was in the movie, and completely awesome. Not only did Toho let them use Mechagodzilla, they got to use the theme song too! That made me irrationally happy.
I give it a b-. Maybe a c+ in the long run, as I'll probably only watch it once or twice in the future.