Eh... Casablanca isn't overrated a whole lot, because it actually lives up to the hype people give it (well, some people). But Citizen Kane is overrated, totally. Its a good movie and all but... people make it out to be the best movie ever which it isn't. Besides, just because somethings overrated doesn't, by any means, make it a bad movie.
"You know what would look better on your nose? The bar. Now don't mess with me." - Ben, Full Throttle