Like the old drive-in speakers that you used to hang on your half-lowered car windows, it may not be the best way to experience the medium. But if your head's in the right place, it can be a heckuva lot of fun.
Tarantino and Rodriguez assume that we'll relish the movie's violence or shrug it off as play, as they do, but not everyone in the audience will want his enjoyment of it taken for granted that way.
Grindhouse is both impressive and disappointing. From a technical and craft point of view it is first-rate; from its standing in the canon of the two directors, it is minor.
I enjoyed the invented trailers the directors fold into the mix, but despite the jokey 'missing reels,' these two full-length features are each 20 minutes longer than they need to be, and neither one makes much sense as narrative.
Too often the films fail to separate what made drive-in shockers good (unapologetic bad taste and an ability to generate excitement on a shoestring) from what made them bad (the kind of self-indulgence that homogenized studio products filtered out.)