[flame suit on]
Honestly, I'm a sports car guy, so I dislike most SUVs. But:
I hate the HUMMER H2 most of all vehicles I've encountered. It is a disgusting waste of mass. An obscene sheet-metal sculpture signifying the obesity and waste that is plaguing America like a disease. Worse than its size is its lack of purpose.
The HUMMER H1 is equally as big, but bullet-proof and a great all-terrain vehicle, and functions well for military purposes. I hate it as a grocery-getter, but I don't hate the vehicle in itself: only the people who put it to such misuse.