Of course it's not a deep film, but nor is it pretentious. It might also not please everyone - if you don't want to have a good laugh, or if your French is challenged, you could find it dull. But true laugh-out-loud comedies that feel genuine and refreshing (like this one) instead of grotesque and vulgar are few and far in between. Moreover, and even more rare, the whole audience - me included - seemed to be howling in laughter, not just three people making a lot of noise.
While the pun is largely based on the local "ch'ti" dialect, it is not limited to it and humour works throughout, well timed and mastered by the actors. The dialect itself was ably used, and the audience are introduced to it nicely. Boon is wonderful, both touching and funny, and Kad Merad delivers a nice performance. More than the dialect or the actors, the region itself and its people are beautifully pictured, and the spirit is well captured. Clichés are used for comedic purpose, and are dispelled instead of being woven. Amateurs will also find an incredible short appearance by Michel Galabru (my favourite part of the film). The film never aims to be realistic, and never seems pretentious, but the feel of Northern France is genuine.
In the end, it is a truly pleasing film: funny, true to itself, fresh and nicely French (but not the part you are most used to seeing) is what you should expect.