And it didn't help that the The LEGO Movie, which was popular with both critics and movie audiences alike, wasn't nominated for Best Animated Feature. As such, it effectively defaulted to Disney's Big Hero 6, which was not as popular as Frozen, the previous year's winner, as the winner in that category.
Small wonder why more and more entertainment company money are now being spent on high production value television series instead. It's not a coincidence that we've have some great TV series in recent years: Mad Men, Breaking Bad, Game of Thrones, and so on.
Argo, Million Dollar Baby and The Departed were pretty popular. Not to say they were deserving winners.