the power to weight ratio of the 6-cyl WJ and WK leave a lot to be desired but the ratio is on par with many other competing SUV's so from a market perspective I'd say Jeep did not do much better or worse than the competition.
After owning an I6 ZJ all of the GC's I bought afterwards had V8's.......a Hemi WK is one hell of a street brawler even in stock form against many other SUV's in same size/weight class.
2008 Grand Cherokee Limited 4X4, Light Greystone Pearlcoat, Hemi, Tow Group, 18" Chrome Clad Wheels. Original owner, 20,000 miles
2002 Wrangler Sahara, black, 4.0L, 5-speed, Dana 44 rear axle with Trac Loc LSD, duel tan tops, Canyon wheels with Wrangler Silent Armors. 75,000 miles, 2nd owner.