Absolutely true, Ebert also didn't give Brazil a glowing review either but now it's a cult classic.
Which is a shame, I think, since Ebert was spot-on with that call. My favorite Terry Gilliam film is 12 Monkeys, but the whole debate on that and the problems of Brazil is a whole other topic entirely.
That said, I do agree that the critics can
be wrong about films. It's not uncommon among now-classic films to find that they received negative reviews at the time of their release. However I can't really think of (m)any films that have had that happen since the rise of the Internet. Can anyone provide more recent examples of this happening?