My Lucerne (Lucy) is a pretty car and she has never given me trouble. I wanted a white car, and got one used in great condition from a totally reliable dealer here in Tyler, TX. At first I didn't like how Lucy handled, but then, it is a 2009 Lucerne as opposed to my 1994 LeSabre, which I miss to this day. As for as a Buick, I am totally surprised with my choice to get another one but the LeSabre was a good friend to me, and I figured a 2009 would also be my reliable car. I recommend to anyone, get a Buick!
The ONLY problem I have with the car is the lane visibility in the drivers side mirror. It creates a "blind" spot that I have never had on any other car. Other than that, I am very pleased with it so far.
The 2011 seems to have fewer issues than it's previous years, however, I'd suggest you still look at problems reported, such as oil leaks and fuel filter issues. Not a bad car by any means. It's really just a grandpa car. That's all.