The 2008 Jeep Grand Cherokee suffers from a smaller cabin and lower-quality materials than its main competitors. The chief problem is that the rear seat is sized more like one in a compact car than an SUV, and the rear cushion is low to the floor, making the second row an unpleasant place for a tall person to spend much time.
Kelley Blue Book reports the " Jeep Grand Cherokee can accommodate four adults in comfort -- five in a pinch." There's also "noticeable improvement in rear-seat legroom as well as ease of entry and exit, thanks to the longer rear doors"--a plus for passengers who do not like their knees meeting their ears. They complain, however, that the Grand Cherokee Jeep "does not offer a third row seat, and interior space is nowhere near the levels of larger SUVs." About the front, ConsumerGuide reports that "headroom is not generous for six-footers, but there's ample legroom and shoulder space on supportive seats"; regarding the rear, it's "quite firm and not contoured for best comfort," adding that "three adults fit, but none have much foot space."
ConsumerGuide says cargo space is "ample by absolute standards but subpar for the class." Edmunds confirms this: "[Grand Cherokee Jeep] cargo capacity is low for this class, with just 35 cubic feet behind the rear seat and 69 with the seats folded.
Quality of the materials and switchgear inside the 2008 Jeep Grand Cherokee is an issue. Some of it isn't great, but the real wood used in the Overland trim level does raise the bar. Car and Driver terms the 2008 Jeep changes to the interior only "a start," calling the interior hard plastic "a merciless prison." Jalopnik notes, however, "door panels have new armrests for improved ergonomics and comfort," and Kelley Blue Book praises the interior: "quality materials abound and the layout, execution and attention to detail are all first-rate."
The Grand Cherokee Jeep is rated by Car and Driver as "the quietest" compared to a HUMMER H3, Toyota FJ Cruiser, and Nissan Xterra when cruising on the highway, but in off-road tests, "its steel unibody sometimes emitted painful gronks when twisted." ConsumerGuide says that "one test 5.7 V8 AWD Limited suffered modest gear whine at highway speeds," while the 2008 Jeep diesel "makes a slight clattering noise at idle and during full-throttle acceleration," and "the SRT8 V8 provides a NASCAR-style soundtrack."