One of the best Marvel movie adaptations since Iron Man; Thor sets the bar high in the wake of the other Avengers' origin movies.
It has to be said that my anticipation and expectations of Thor were both fairly high. Thor is my favourite non X-Men Marvel character, and I have a soft spot for Miss Portman. Luckily, I was not disappointed, and I'm now more excited than ever for Joss Whedon's The Avengers.
Thor tells the story of how the titular god of thunder (Chris Hemsworth) disobeys his father Odin (Anthony Hopkins) and seeks vengeance on the Frost Giants of Jotunheim, resulting in him being stripped of his power and banished to Midgard (Earth). There he meets Jane Foster (Portman), an astrophysicist researching inter-dimensional gateways. While on Earth, Thor must earn the right to his power in order to save the Nine Worlds from destruction at the hands of Loki (Tom Hiddleston).
The feel of the Marvel comics on which the movie is based is definitely present throughout Thor. The battle between the Asgardians and the Frost Giants is particularly well executed; the power of Mjolnir is never overused (something I was worried might happen) so we get to see how much of a badass Thor is without him being too powerful.
The best performance of the movie had to come from Hiddleston as Loki. There is something very theatrical about his performance that adds both to the mischievous and sinister sides of this character. Also noteworthy are the Warriors Three: Fangral (Joshua Dallas), Hogan (Tadanobu Asano) and Volstagg (Ray Stevenson). Their camaraderie and banter make for a light hearted but not overly comedic compliment to the movie.
The only downside is that the movie is unevenly split between Earth and Asgard. Since Thor is an origin story, I would have liked to have seen more of a fully powered Thor on Earth, whereas most of the time was spend on Asgard (though the sets and environments of Thor's homeworld are amazing). It seemed that his screen time on Earth was all too short to develop any proper relationship with Jane Foster, and to demonstrate his power as god of thunder.
In short, Thor is a well put together origin story that sets the bar high for the following Avengers' movies. It is probably the best Marvel adaptation since Iron Man; with a superb cast and brilliant effects, Thor is definitely one to watch.