Insulin resistance in fat cells means you lose fat easier and makes gaining fat harder.
Insulin resistance may be a way for the human organism to limit excessive fat/weight gain. Not saying insulin resistance is good or healthy, but something to think about.
An obese person who goes on a diet loses fat at an insane rate and insulin resistance may play a part in that.
It's also interesting how exogenous growth hormone makes you leaner while causing insulin resistance. "Fat burning" drugs like beta agonists also cause a degree of insulin resistance.