I think there's an odd skewing in these top film lists, I tend to think no film should be allowed onto any top 100 list until we can look back at it. There's excitement about the film still, but will we still think it's that good when we look back in five, ten years time? If we don't, it wont move back down IMDB's list.
The Avengers was a great film, action packed with cool effects and humour but it really wasn't top 100 quality.
I mean, better than Last Crusade at 103? Nope.
Better than Up at 109? Nope
Better than Return of the Jedi at 94? Nope.
How about The Thing at 161? Nope.
On an unrelated note whilst watching The Avengers I worked out why I find Scarlett Johansson so ugly. It's her lips, they don't ever move, not at all, not ever and that's just plain weird.