It's been about six years since the GMC Sierra got its last full redesign (for the 2007 model year), but this truck's rather formal, conservative look has stood well to the test of time.
Just as its Chevrolet sibling, the Silverado 1500, the Sierra 1500 is very conservative from the outside, and it doesn't depend on a lot of styling tricks to convey what it's selling--durability, dependability, toughness. The big rectangular grille is simplicity itself, and the corners are just a bit more pronounced than on the essentially identical Silverado. With the big GMC logo on the grille, there's little risk of mistaking the 2013 Sierra for any other model, but from the side or rear, it can appear just a little too plain for some tastes. That plainness is a pleasing contrast to some buyers next to the somewhat overwrought Toyota Tundra toe a weirder line, and while the Ram 1500 gets even softer and more carlike on the inside for 2013, it remains intimidatingly (for some, embarrassingly) tall and tough on the outside.
The Sierra's interior is where it's starting to look a bit dated. Less expensive versions still sport a simple, upright design with larger controls and door handles--taking aim at those who want a work-duty truck--while pricier versions get a cabin that feels almost directly borrowed from GM's full-size SUVs like the Chevrolet Tahoe. With the latter design comes a lower, smoother instrument panel design, with materials and trims upgraded accordingly. The only trims that don't quite fit are the woodgrain ones, which are neither convincing on a luxury basis or fitting in with the Sierra's mission.