My experience was the opposite. It was astounding. Amazing drivetrain, approach angle. I've heard them badmouthed and I'm amazed.
Mine would crawl up a cliff or go through ridiculous swamps. Haven't seen anything that would equal it except when it came down to absolute weight making the difference.....like crossing quicksand

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Took my Hummer across Russia along with 2 80 series LC's. If you are familiar with the trip it ain't for toys.
Worked our winches a lot. You really need three vehicles for the Russia trip. Some rivers are deep, wide and scary. I pulled the trailer because the Hummer had so much more power. Most of the time I didn't even notice it was there.
Yes another Hummer is on my watch list. Definitely want one. Haven't seen anything that would come close to doing things so easily....but there are some amazing products coming out now.
I collect Porsche's and I'm starting a 4WD collection. (So far have 2 LOL) My girlfriend wants a newer model so I'm looking at 2008-2011