My favorite scores range from the 1980s through the 1990s. Indiana Jones Trilogy, Back to the Future, and Secret of NIMH for the 80's. Then the 1990s had Bruce Broughton's Lost in Space soundtrack. The Lost in Space movie (I say this without shame) is perhaps my favorite movie score of all time to listen to. It's not the most powerful score, but it is one of the most memorable scores I've ever heard. Just listen to this!

http://www.youtube.com/watch?v=kAPJprWG2-Y

My least favorite would have to be... Any era of movie soundtracks where orchestral music isn't used at all. Scores just don't work when there's no orchestra performing it.