1970s:
1. 'Robin Hood' (one of my personal favorites of any decade)
2. 'The Rescuers' (though, surprise, I actually like the sequel better)
3. 'The Aristocats' (one of their weaker animated features, IMHO)
'Escape to Witch Mountain', 'The Apple Dumpling Gang' and 'The Black Hole' were all entertaining, but the '70s definitely wasn't the strongest time for Disney.
1980s:
1. 'The Great Mouse Detective' (also one of my personal faves)
2. 'The Little Mermaid'
3. 'The Black Cauldron'
LOTS of great live-action movies: 'Flight of the Navigator', 'Dragonslayer', 'Something Wicked This Way Comes', 'Return to Oz', 'Honey, I Shrunk the Kids' and - of my favorite cult movies - 'Midnight Madness'.