@stang
If you live in the United States you have a few options. Check your states "lemon laws'. If you feel like your situation meets your states requirements then get a lawyer and try to get a new car or a refund.
Your second option is to stick it out and never buy/lease a vehicle made by GM again.
Part of the reason I leased my Regal was because it seemed to good to be true. I knew it was too nice of a package to be true. My RL5 had a residual value of $17,500 (according the GMAC) when I signed my lease last May (39,000, 39 month). I find it hard to believe that a $29,980 Buick will be worth $17,500 when it is 39 months old with 39,000 miles. Since I couldn't compare the number with previous Regals then I used the Lucerne as a benchmark. I was able to find 3 year old Lucerne's going for $11,500 to $13,000 consistently that were priced around $30,000 when new.