Great, but among the best of all time?

Rating: 9/10 (10 July 2002)

Very clever, beautifully photographed and edited, always interesting, and, unlike so many "important" films these days, comfortably under 2 hours in length.
But in the Top 10 films of all time? Am I missing something here? The plot is outlandish and full of holes, as some reviewers have already amply pointed out. Memento is just too flawed, despite its ingenuity, to be rated as a great among greats. Very good yes (I gave it a 9), but unlike Citizen Kane, Schindler's List, Casablanca, and The Godfather, it is far from cinematic perfection.
Then again, the IMDb top 250 baffles me anyway at times. My above comments apply to The Shawshank Redemption too--what's going on there?
I am, I think, somewhat older than the "average" IMDb reviewer, so I have a nostalgic bias toward older films. I could watch Rear Window over and over again, but I have no problem sending Memento back to the video shop without a second watch. But that's just me.