Let's try to understand the miracle I have just witnessed. Director Wes Anderson is 12 years old, has just experienced his first love while at Summer camp, and immediately rushed to a camera to tell us, his pen pals, the story. A slightly embellished story which follows the perfect scenarios we would draw at night in our beds at this age. It has all the tiny details, the sense of adventure and the freshness of youth. How someone 43 years old in real life could do this movie is beyond me. The drawback of this miracle for the viewer is that such a jump back into the kind of idealized feelings you had in your early teens leaves you with quite some melancholy when you leave the cinema.
It could be that some people do not connect to the movie and just see it as "adorable" or "cute" and nothing more. But I suppose most people will feel connected, notably because the movie has this straight-to-the-point attitude in both the technique and the story-telling; the story is read to you, not force-fed with dramatic music and whatnot. Just like one of the characters who reads bedtime stories to the others.
You might complain about the lack of character development for some of the big names in this film (Norton, Willis, Murray - McDormand less so as she gets more detailed screen time than the others) but I suppose this is wanted: kids will see hints of the issues adults are facing, but can't understand them fully. And remember this is a movie shot by 12-year old Wes Anderson.