°•»Bilbo Baggins says«•°
It's rather difficult to compare the two series as they are largely different in some aspects. I think the overall tones and moods are too separate to really discern any kind of arguable comparison. In the Star Wars Prequel Trilogy, the theme is admittedly much darker than the Hobbit's. Although, both involve someone changing for the worse, at least one has a clearer conclusion.
I believe Lucas' intentions for the Star Wars Prequels was to provide more backstory for the movies that would follow Luke, Leia, and Han. It's supposed to fill in some gaps for the watchers to understand what exactly motivates them so much to go so far to stop the Sith, etc. A big part of those Prequel movies was to tell the story of how Darth Vader came to be. In my opinion, the Prequel trilogy of the Star Wars' Series can better be classified as a prologue than the Hobbit can. I say this because J. R. R. Tolkien admitted to writing the Hobbit as a "warm up" for the darker, more serious Lord of the Rings series. And in truth, you don't necessarily need to watch the Hobbit to gather any more information in the Lord of the Rings series than what is already given to you. The story of Bilbo is only mentioned in the Lord of the Rings trilogy, and that is only to bring about the danger of the ring. You don't need to know how Bilbo got that ring (and I'll add they tell you in the Lord of the Ring's trilogy anyways), and they even supply you with clearer information of how Gollum obtained it. They never mention Thorin and his Company, or the tale of Smaug. It's almost like two separate trilogies, only linked by characters and the world of Middle Earth. Though, Peter Jackson did try to incorporate more little hidden Lord of the Rings' goofs in the Hobbit, the book doesn't contain any information about Frodo or his adventure to be, or even any foreshadowing of what's to come for the most part. This being said, I can easily say the Hobbit is a less of a prologue than it is a separate series.
I was fine with the more comedic tone of the Hobbit. It's more of a younger-audience type of movie than the Lord of the Rings (younger-audience meaning the lower half of the teens or around there.) When I read the book, I didn't get the same sense of urgency as I did in the Lord of the Rings books. This is in part because the Hobbit involves only Thorin and the dwarves adventure. The threat isn't one that threatens all of Middle Earth, only the lives of those traveling back to take Erebor. This escalates to much grander scale of action with the Battle of the Five Armies, but initially, the threat was contained to a small portion of the world. And even with the Battle of the Five Armies, you still got the sense it wasn't nearly as global as Lord of the Rings (where the threat is already threatening Middle Earth right off the bat). Plus, with the knowledge that Tolkien meant the Hobbit to be more of a warm up for the Lord of the Rings, you can enjoy it with a little less criticism in my opinion and just appreciate the process the author took to make this world come alive. As for the quality of the movies, I think it was to be expected. Smaug could NOT have been made entirely out of prosthetic and material as they might have making the Lord of the Rings trilogy. And in order to lure more audiences out, they needed to impress the public with more current technology. I'll admit it's kind of a let down for this to happen to movies nowaday, but it was a SMART move on Jackson's part. It might surprise most of you, but many people have NOT watched the Lord of the Rings movies. Jackson knew this, and much of today's audience want better, bigger graphics and won't watch films simply because the graphics aren't current. If Jackson hadn't gone the more modern route with the CGI and special effects, the Hobbit probably wouldn't have been as lucrative as it should have been. And although we (being LoTR fans) might appreciate the little nostalgia it brings, we'd probably be most of the income they'd make. But they did a marvelous job with costumes and they still did use a lot of makeup and old school methods to creating more realistic characters and what not, but ultimately I felt like Jackson did a smart thing by not taking it all the way back.
Wow. That's quite the speech... But anyways, that's just my opinion. :]
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