You probably need go be familiar with Peanuts to get the subtleties here, but this was an awesome retelling of the many adventures of Snoopy, World War I flying ace, and how the Peanuts gang is effected. The language and tone are the same as Charles Schultz used. The artwork also mirrors, and doesn't try to simplify, Schultz's unique style.
The only problem is that Linus seems a bit out of character. I don't remember him ever being such a little shit. Other problem that didn't bother me but will bother diehard Peanuts fans -- Charlie Brown appears in a red, not yellow, shirt.