it's a truly funny funny film. The spirit is exactly like the books, the humour goes right to the point of them, where we have lots of social reflections (about economy and tourism, or being happy just for having things) while we laugh at them. The animation is pretty good too - i'm not the biggest fan of their faces while drinking the potion, but it's just a small detail.
The fact is: the humor that makes these books so good is completely here. They didn't try to over complicate or anything, they finally made a Cesar that is clever and has a refined strategy, they grabbed what it was funny about the people of the village - the fish and metal owners fighting, the old guy screaming, the importance the chief gives to himself...we get to see a few village fights in this! even the gags of the musician were awesome, even thought they were predictable! I don't know, it just worked. I laughed my ass off, and you can watch it with your whole family. A great surprise i had. Go and watch this movie, i'm sure you won't be able to see it without laughing in lots of bits. Really great stuff.