If you can make some allowances though, this really is a lovely movie. Not just because of the spectacular forays of Walter Mitty's imagination takes us on -- which are delightful not because they're fantastic, but also because they're wrought with his sense of wit -- but because of how extraordinarily spectacular it shows reality to be. The scenes and locations and the raw scope of this movie were all awe-inspiring. And I may get some judgment for this next statement, but it almost felt like a Terence Malick movie for the masses. There's that same appreciation for the fleeting, although it's more overt (and more accessible) than your typical Malick feature.
Ben Stiller is in high form here. His directing is a bit heavy-handed at times, but his acting certainly isn't. Both his performance and the humor are unforced and natural, making Mitty a thoroughly enjoyable and immersive experience. Mitty treads a fine line - actually achieving sincerity without coming off as cheesy or manufactured. A few times it teeters, and we get a glimpse of Stiller behind the movie (not to mention a few questionable moments that only exist to move the plot forward), but for the most part it's a gorgeous understated endeavor. Wonderful supporting work by Sean Penn, Shirley MacLaine, and Patton Oswalt definitely aid in this. Kristen Wiig is another high point as Mitty's love interest.
This movie isn't for everyone. But if you can forestall the cynicism that permeates so much of media today, you're in for a stirring ride.