(CNN) -- When it comes to the Academy Awards, Hollywood has some biases.



The late Heath Ledger won a Golden Globe for his performance as The Joker in "The Dark Knight."



Summer blockbusters get short shrift. Comedies aren't taken seriously. And animated features? They almost never get drawn.



Which, on the surface, doesn't bode well for three of the biggest movie stories of the year: "The Dark Knight," Robert Downey Jr.'s performance in "Tropic Thunder," and Pixar's latest marvel, "WALL-E."



Each earned critical plaudits and box office success. And each faces an uphill struggle nabbing major-category Oscar nominations when the Academy of Motion Picture Arts and Sciences announces its shortlists Thursday morning.



Awards expert Tom O'Neil, who follows the Oscars for the Los Angeles Times' TheEnvelope.com, says the best-picture front-runners are "Frost/Nixon," "The Curious Case of Benjamin Button," "Milk" and Golden Globe best drama winner "Slumdog Millionaire." Barring a completely out-of-the-box surprise, that leaves "Dark Knight," "The Reader," Clint Eastwood's fast-gaining "Gran Torino" and possibly "Doubt" or "Revolutionary Road" to battle for the final slot.  Watch who took home the Globes »



O'Neil believes "Dark Knight," the year's top box office draw, has "an excellent shot" of making the best-picture list.



"We know that because Oscar voters belong to guilds that have their own awards, 'Dark Knight' has a strong chance," he says, noting that the Directors Guild, Producers Guild and Writers Guild have all nominated "Dark Knight" for their top awards. Read what EW's Dave Karger has to say about that



"WALL-E," however, is almost certainly out of the best-picture race, he says. Animated features, no matter how successful, have fared poorly in general categories. Indeed, only one animated feature -- 1991's "Beauty and the Beast" -- has ever been nominated for best picture.



With the addition of the best animated feature category in 2001, it's doubtful that even the best Pixar has to offer will cross over to best picture, particularly since the Academy ignored classics including "Snow White and the Seven Dwarfs," "Fantasia" and "Toy Story."



"Oscar voters like reality," says O'Neil.



Either way, the Oscars could probably use the ratings help a box office success can bring to its broadcast. In recent years, the Academy has nominated several independent or low-budget films for top awards, many of which didn't crack the $100 million mark at the box office. Oscar ratings have tumbled; last year's numbers for "the Super Bowl for women" -- as the Oscar broadcast is known by advertisers -- were the lowest on record and a far cry from 1998, when more than 55 million people watched all-time box office king "Titanic" take home the top prize.



That's not to downgrade the expected front-runners, especially since the Oscars' intention is to honor some of the year's best films and performances (though critics have carped they've often not done so). Still, it might behoove the Academy to pay attention to box office as well as prestige, particularly when several films have garnered both. Almost three-quarters of the respondents to an unscientific USA Today Internet survey have said they'd be more likely to watch the Oscar ceremony February 22 if "The Dark Knight" is nominated for best picture.



"If a film is very successful, it shouldn't be automatically relegated to the minor leagues," producer Peter Guber told The Associated Press. (Ironically, Guber co-produced the 1989 "Batman," which, despite big box office and Jack Nicholson's Joker, was nominated for just one Oscar -- for Anton Furst's set design. It won.)



Historically, summer blockbusters haven't always been ignored. "Jaws,
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