Ok. Finally finished last night. The game doesn't create a clear file, so I'm going to estimate my final time at around 64 hours. I found all the heart pieces on my own (a first for a Zelda game) so I agree with whoever said they weren't hidden as well as in previous games. More cleverly hidden are the bugs and poes which, now that I've finished the game, I will use the strategy guide to finish collecting.
Overall game thoughts:
Twilight Princess is fantastic, one of the most complete and beautiful adventure games I've ever played. That said, I still think Ocarina is better, mostly because it has more surprises in the gameplay while Twilight Princess is more of an evolution and refinement of Ocarina. With that comparison out of the way, there's no doubt in my mind that Twilight Princess is far and away 2006's game of the year. I do not feel, however, that it surpasses Resident Evil 4 as the best 4th generation game.
Component parts:
Graphics: From a technical standpoint, they're nothing special, but Nintendo makes up for this with EXCEPTIONAL art and lighting design. I can't believe it's taken Nintendo this long to figure out how to use lighting properly in a game, but holy shit did they nail it this time.
Sound: Competent. No complaints.
Music: Very good, but lacking any new catchy tunes.
Story: Poor by game standards, but good by Zelda standards. Comparable to the quality of the stories in Ocarina and Majora. My main complaint here is that (like most Zelda games) the story starts off incrediby strong and then completely falls apart in the last third. At least the cinema scenes are directed with a level of care and quality Nintendo has never delivered in the past.
Difficulty: More or less appropriate on the whole, which is a good thing. The bosses should have been more difficult, but the dungeons were toughened up after Wind Waker's cake walk, though I guess they could have been a bit more challenging. I'm not saying they should be as ball busting as Majora's dungeons, but maybe closer to Ocarina's challenge level.
Control: Superb. The game controls fluidly on both Wii and NGC, though I recommend Wii for the more comfortable controller and precision aiming, despite the slightly fatiguing motion-activated sword swinging and lack of free camera control.
I would also like to give special kudos to Nintendo's designers for designing this game to have far less back tracking and retreading than most games.
Finally, I am I the only one who got a very pleasant Zelda II vibe from this game? Some of the enemy and architecture designs tugged at the heartstrings here.