I have a hard time envisioning thor as a decent movie. I would be happy to be proved wrong, though.
The first attempt at Captain America was way below sucky. It was if they were trying to see how bad they could make it.
The Avangers could be killer, depending on the character mix they decide to use.
Now that Marvel is calling their own shots, I look for superhero movies to become something great.
**EDIT**
Where I get my comic book movie info:
E.Favata's Comic Book Movies
**/EDIT**