The public tend to be ignorant when it comes to judging really great cinema, so the IMDb Top 250 is invalid. The fact that Kick-Ass ranks higher than Ikiru proves this. If it entertains them, chances are it will be rated high.
I'm not trying to be a snob, I just simply don't believe in the concept that all opinions are created equal. Sure, you can't empirically prove that one work of art is better than another, so it would seem that someone's opinion is just as valid as the next person's, but I never bought that idea.
A film critic who's spent his career watching, studying, and writing about film will have a far more informed and intelligent opinion about cinema than a soccer mom who takes her kids to go see Toy Story 3, or a frat boy who thinks The Hangover, Superbad, and The Pineapple Express should be canonized as some kind of cinematic holy trilogy, so I don't understand why I should consider their opinion on the same level as an Ebert, Pauline Kael, or Dwight Macdonald.