Pixar, to date, has been sterling. Even their middling efforts (Cars, as most would say– but I’d disagree) hold to a higher entertainment standard than most films bust months of hump to achieve. The Disney/Looney Toon reminiscent shorts, the cute vignettes shown before the Pixar movie you’re paying to see, are usually equally stellar– just bite-sized. With this year’s Pixar project Up just a few weeks away, Pixar has released a snippet from the short preceding it: Partly Cloudy. If …