I was going to open a similar thread, but of course, getting my paws on the game a week late, I was beaten to it

So I'll just add my thoughts to this thread.
I was very excited when I read that Telltale will tackle Wallace & Gromit, and I was also very curious how these superb claymation characters can be adopted into a video game - especially an adventure game, as the episodes tend to have a lot of high adrenaline action. In general, I think I can say Telltale was very successful in their attempts - here's the breakdown:
Atmosphere is one aspect where the series really shines. The creators of the games obviously invested a lot of effort into recreating the Wallace & Gromit universe on the PC (and on the Xbox), paying attention to the miriad of tiny details which makes the Aardman's flicks so adorable. The result almost measures up to the original films - sometimes I had the feeling I was playing through a Wallace & Gromit short.
Immersion can be mentioned here, also. The first episode didn't really excel here, but in the other three, it worked really well. Can't put a finger on exactly why, though.
The
stories were very well written, I believe a lot of consulting was done with Aardman on those, to excellent results. I had one issue here, I really missed a larger-than-life antagonists in episodes 1,2 and 4 - just the kind Monty Muzzle was in episode 3. But apart from that, the stories held up really well, they kept me interested throughout the games, and all the threads were very nicely sewn up in the final episode.
It's obvious that Wallace & Gromit are the best Telltale series
graphically. Telltale staff were hinting that a lot of work went into updating the engine, and it shows, too - the games look fabulous, and while they don't have (over)hyped effects like ambient occlusion or motion blur, I don't find them less appealing than many of the games that feature these effects and bring high end video cards to their knees.
At some places, I would have preferred more complex models and higher resolution textures, but I guess the games would end up around 2GB that way, so it would have made it difficult to make the distribution download only.
Sound and music: both were OK, I didn't really find anything outstanding. This also made me a bit disappointed - while the music fit the games very well, I somehow expected more from Jared. With the Sam & Max games, I sometimes start one episode to stroll around and listen to the music - I don't see I'll do this with Wallace & Gromit. There were bits of excellence (most prominently, the chase music from Ep1 comes to mind), but more more more would be very welcome.
The
controls were the subject of much debate, but to be honest, I think most people overreacted. I'd have preferred a point-and-click game myself, but the control scheme was all-in-all very intuitive and easy to get used to, so I found nothing significant to complain about in the end.
Finally,
puzzle design and difficulty. Difficulty was a rollercoaster affair in the series - Fright of the Bumblebees was way too easy, then The Last Resort was a step more difficult. The puzzles was still quite evident, but there was some thinking necessary during the game, and it had a good rhythm. Then Muzzled! was again quite easy, and finally, The Bogey Man had some quite headscratching puzzles, and it was more or less the right difficulty for me.
Puzzle design was excellent throughout the whole series, obviously with great focus on breaking linearity, and good subtle hints.
To sum it up, Wallace & Gromit's Grand Adventures was an excellent series, the games provided excellent entertainment, and each one is worth at least one replay. It may not be very probable, but I hope for a second season!