I've been used to the Academy's "worth over quality" decisions (only in IMHO of course) over the years.
The only real time I've been genuinely shocked was when "The Silence of the Lambs" cleaned up!
A genre film, that was popular with the audience, and didn't have any social statements to make!
Doesn't happen very often ...
Titanic and Gladiator could perhaps be added to that list.
Apart from the fact that both have lavish historical settings, they're both big dumb blockbusters.