https://www.motortrend.com/news/2019-ca ... B1AF38D356
Obviously this is just a very short take as there is a lot more to discuss (highs and lows both).
Technically each decade yielded some kind of achievement but there were some differences in terms of popularity or reliability.
Looking back it would seem that the 80s were the worst years for Cadillac and even as the NorthStar would go on to earn a pretty bad reputation (not really until the late 90s though), the cars themselves started at least reviewing positively by the early 90s.