By comparison, Thor was already released in Australia, so that's one reason for the early reviews for that.
There's a very good chance Marvel could go 3-0 this summer. There's a series on Marvel movies on Rotten Tomatoes. Using a somewhat loose definition (includes Men in Black, but not loose enough to include the Transformers trilogy), they retrospectively review 34 Marvel Movies.
As far as Green Lantern, I've heard that they're working on a sequel, but it's going to be an attempt to fix what was wrong with the first one similar to what The Incredible Hulk was compared to Hulk and probably like what Man of Steel should be compared to Superman Returns.
I just don't think Green Lantern is that bankable and they'd be better off trying to get Wonder Woman on the big screen. Of course, they tried to get Wonder Woman on TV and that failed. They've got a ridiculously short bench.