Remember that the typical auto insurance policy lets the insurance company settle your case without your consent. But, more importantly, it also lets them choose not to settle a case. What does this mean to you?
If your insurance company chooses not to settle a case and take it to trial, you could have a judgment against you. So? Well, for a period of time, this may appear on your credit report. And, if you want to buy a house, get a car, etc... you may have a difficult time with a judgment against you.
Remember that you should talk to your attorney if you are sued. Yes, the insurance company will pay for the attorney, but the attorney represents you. Get him or her to explain to you the consequences of decisions that are made. You have a right to be involved, especially since the judgment is against you and not the insurance company.