Avengers was really good, but it's not better than Dark Knight.
The movies should not be compared. One is fun and filled with humor and one is driven on darkness. I enjoyed them both but for extremely different reasons.
Yeah, totally different extremes of the same genre. Marvel has been purposeful in going with a lighter tone, and I think it serves this group of characters well. There are some Marvel characters that could have that same gritty pseudo-reality treatment that Nolan used so effectively in Dark Knight, but with Hulk, Thor and Iron Man it would be ridiculous.Both are great in their own way. Though I do have to say, for pure entertainment and joy, I'd probably watch Avengers 9 times out of 10 over Dark Knight. The other time I'd likely be drunk and pissed off about something.