Indias bowling attack might appear pissweak to others, but it always kills Australia. Sharma will bowl like Tremlett did last summer, and Zaheer will swing it well. Any above average spinner (and Ojha is pretty good) pegs australia down.
You could count the amount of times Australia have scored 400+ on the one hand in the last 3 years. Noone scores hundreds and noone gets big hundreds more importantly.
As weird as it sounds, I also think India save there best cricket for Australia, and I read nothing into there 4-0 loss in england this year.