Aye. The thing is, the Oscars are decided by the Academy of Motion Picture Arts and Science. They're concerned more with just whether the movie was a good way to spend three hours.
That said, I don't think deciding that plot is an important part of a movie is being picky. It's not like movies are a narrative medium or anything like that. Clearly we shouldn't want to have a well developed or remotely original plot. That would be ridiculous! And picky!