"Brokeback Mountain" and a slew of other arty, less-widely seen Oscar-nominated flicks are expected to take the polish off ABC's ratings for the Academy Awards this year. With no big-budget films like "Titanic," "Gladiator" or "Lord of the Rings: Return of the King" in this season's crop of nominees, ABC may be staring down the barrel of one of the lowest-rated Oscar telecasts in recent memory when it airs on March 5, say TV-industry analysts.