Nothing
I don't get why everyone hates these Rodeos. My family has four of them, ranging from 01's to 03's. We have never had a single problem with them. We originally bought one for my mom and enjoyed the treatment at the dealership and the quality of the vehicle so much we came back for 3 others. If you drive like a maniac and gas hard and brake hard of course you are going to have issues and excess oil consumption. My first car was a 1990 Isuzu Amigo 4x4 and I did my dumb teen best to destroy it in the mud and swamps of Florida, but it was too well made. That vehicle made my father a believer of the brand. And if you do have any major problems, of course there are exceptions when you mass produce anything, you always have the lengthy 10 year warranty to comfort you.
I own a 2002 Rodeo LS I bought it with 58k, and now I am at 69k. I love it.
Before this I owned a 1999 Rodeo LS for 5 years. My kids drove it and beat the crap out of it, and it still never gave me any problems. It finally died last year with 170k miles.
I'll never switch, and I would buy one again!