Agreed. Marlon Brando went to the William Shatner School of Overacting before he did his cameo in this turkey. I saw it when it first came out at the theater. Depressed as I was when I walked out, I had major trouble with the plot and I thought the concept of a rouge general Brando out in the jungle totally unbelievable. I guess Coppolla was trying for some operatic Vietnam but it just didn't work for me and I really don't see what folks praise it for.
Oh you've got to be kidding me! Citizen Kane is brilliant. The social commentary on the most powerful media person of the first half of the 20th century (William Randolph Hearst) is scathing. And, in its day, daring and dangerous. The lighting, shading, camera angles were cutting edge and the story of a man who loses his ideals is classic. Sorry but I cannot agree here. Citizen Kane is pure brilliance.
Name them. Bogie was greatness, and while "Treasure of the Sierra Madre", "Key Largo", "The Big Sleep", "The African Queen", and "The Maltese Falcon" (sorry just going off the top of my head!) are really really good, no way are they better than "Casablanca". BTW if you want an underrated Bogie film(s), try "The Desperate Hours" or, if you like dark comedy, "We're No Angels".
Casablance is easily Top 10 of all time. It's the single most quoted movie of all time. It was made in 1942, at the height of the war, and no one had any expectation of what was going to come. Again cannot agree with you here.
I don't know of too many people who think "Titanic" is all that. I mean it's a good flick, but for a tear jerker/action/historical flick it doesn't match up to "Doctor Zhivago". Although it does beat Zhivago when Kate Winslow posed for DiCaprio's drawing. 
I might have to excuse myself on this one. I never cared for this one. I thought it was good and I could see why critics praised it so much, but I just didn't like any character in the flick, and after a while I just didn't care what happened to anyone. Everyone was so nasty. I'm probably letting emotion get in the way but it really really really didn't work for me.
My five:
The Sound of Music (it won Best Picture & Best Director) -- it's like being beaten over your head with a Hallmark card
Singin' in the Rain -- kill me now!!!!!!
Little Miss Sunshine -- sorry but a little girl doing a strip tease dance just creeps me out; not funny and just really ickey all the way through; the dead-relative-on-the-car-trip was done better in "Vacation"
Dancing with Wolves -- okay you could cut an hour (or two or three) out of this bad boy and no one would miss it; and Costner has one (okay maybe two) good facial looks and after that you're waiting for him to hit a baseball or something. Yawn.
Braveheart -- WWF meets history; again over long, historically inaccurate (okay really -- the queen of France wants a Scot? in the 13th century? oh hell no) tiny plot, lots of violence and way, way too much testosterone.
Chris