Hi, I'm a Hungarian writing from Italy, and first of all, I want to thank you for your digital distribution model! It may still have some hiccups, but it's nothing comared to months of waiting for European releases (Psychonauts!!!)
For the most part, I agree with the cons mentioned in previous posts (brief gameplay time, low difficulity), but I never had any real problems with an adventure being too easy. I've been playing adventures for almost twenty years now, in all forms and sizes. I adore complex and long games, but some of my favorite experiences come from Humongous children-adventure titles, like the first Putt-Putt games or Fatty Bear's Birthsday Surprise.
These games were incredibly easy, taking you by the hand, and could be completed in a couple of hours, just like Bone. The difference is, that you could interact with practically anything and everything on screen and that's what was missing from Bone. Of course, I don't mean that every flower should start dancing and singing on screen in the Valley, but a bit more comments and more hotspots would really be welcome!
I also agree that that the Thorn model and voice should be changed a bit. All the other characters are captured too perfectly, and she sticks out a little. Also, because it's her story as much as it is the bone cousins', she should have a more promintent role, otherwise gamers unfamiliar with the comics won't care for her when the time comes... I really missed a lot from her conversations with Fone Bone on the farm (especially concerning the existence of dragons, more on that in a bit).
The last con to point out has to do with dramatic timing. This of course is different to everyone, but it was a bit too perfect in the comics. My all time favorite scene in Out From Boneville is when Thorn and Fone Bone are surrounded by dozens of Rat Creatures in the woods. It's the first time the story takes a darker tone, because it shows that the Rat Creatures are not only "Stupid, stupid", but can actually be rather menacing! It's a sign of the darker things to come, and I was really looking forward to seeing it in the game, but it was cut alltogether, and thus the dragon arrived to save the day with no real sense of relief, and no sense of awe. Plus, the non-belief of Thorn in dragons wasn't really fleshed out, so the emotional drama of the scene was completely lost.
Man, those are a lot of negative things, but I actually enjoyed the game a lot! So much in fact, that I played through again a second time, right after the ending credits! The pros have been discussed so there's not much point repeating them. However, the animation and graphics are excellent, I think the game world looked perfect and wasn't bland at all. I also loved the mini-games, and the voice acting (though grandma should sound a little older).
I adore the comics, and I admit that seeing things translated scene-by-scene is what I usually like. However, I found that the extra parts added (the Firewood/water scene and everything involving Phoney) turned out to be my favorites. The funniest being Phoney's comments during the hide and seek game! I kept making mistakes, just to hear everything he had to say!!!
IN CONCLUSION: The graphical and the audio pros and cons have been discussed by everyone. What I wanted to add was, that the cut-scenes should have a bit better dramatical timing, because that's what helps gamers really invest in the story emotionally, and if they're not interested in the story, they won't be back for The Great Cow Race!
All in all, congratulations TellTale on your first adventure game, I think it you've got a bright future ahead of you! Any criticism is meant for your benefit, and please know that you've given me a fantastic experience! I'm going back to play it through a third time!