Josie,
The best thing to do to learn about a vehicle is to see what others are saying about it. Epinions.com is a great resource for this. Other consumers who have the vehicle will comment about the pros and cons of it. It's really helpful!
Here is the page on the Lucerne:
http://www.epinions.com/content_218766675588
I found this good review here too:
http://www.automotive.com/2006/12/buick/lucerne/reviews/index.html
The other way to know if it is a good car for you is to look at the pricing and your budget as well as spend some time test driving it and make sure the car fits your needs.
I hope this helped!