I was really high when I wrote all that. Sorry. Felt a little gasty.
There are two things going on.
The subjective judgement of the film, which is whatever. And yes, I believe you like L'avventure. (But admit it: lots of people fake it. You can tell.) In this case, I prefer SUPERBAD.
The objective, which we arrive at using the seriousness-of-intent/quality-of-execution metric Robin Williams made such fun of in Dead Poet's Society. In this case, there is no question that L'avventure is the superior film.