My biggest issue with Twilight Princess was it's depth. It wasn't as deep as previous Zelda games have been. There are a lot of characters, but the player only runs into them once, and never speaks with them again. The player has little to no attachment to any characters in the game, other than Link. I found the minigames and extra missions to be more of a chore than something to enjoy, and as such, didn't complete them all.
The story was medicore at best, with the traditional Zelda "oh no the magic thing is broken get all the pieces then do it again for another item" plot. The bits as The Shaggy Link were irritating. I found myself wishing they would end. The plot was standard Zelda fare, with no surprises anywhere. It was very underwhelming. Anyone who has completed more than one Zelda game can probaly guess what's going to happen without ever having played Twilight Princess.
The game world is pretty good looking, but hardly spectacular. Lake Hylia is reasonably impressive, but the rest of the game world is average for today's fare.
The dungeons are very well designed. This was the strongest aspect of the game, and fortunately, the largest. They're challenging, but not annoying or too difficult. There were one or two spots that had me completely confounded, but not for more than 5 or 10 minutes, and the secret turned out to be something very obvious, but not something one would typically think of. Some puzzles were very clever, others very simple. There was a very good balance of how weapons are used. Unlke other games where the player recieves a new weapon/item and only uses it in the immedate level, the weapons in this game are useful the entire way through. Weapons and items from the very beginning of the game are used in the very end.
The control scheme is wonkey. The use of the remote for swordplay was poorly implemented. For aiming projectile weapons it was nice, but I would rather mash a button for sword swinging. I tended to forget to use my wrist, and ended up pushing the button and getting the wrong result, even after playing for a number of hours. Fishing with the reel rod is fun for a short while, if you have the patience for it.
The action is pretty good. Some of the boss battles are really cool, as are the horseback episodes. The regular enemies are a tad tougher and more soldier like, rather than just dumb monsters in the field.
Overall, the game is fun, but not incredible. There are really no outstanding features of this game, but it's a solid title that will provide ample entertainment for 35-40 hours.