Awesome movie! Marvel's movie-making arm does very good jobs with their properties.
Everyone was very well done, and I especially love both Thor and Loki. They got two relative unknowns for the roles, and both of them played their parts so well. Their costuming was excellent, too. I liked how the comic designs were interpreted for the movie.
I want Heimdall. *swoons*
Sif and the Warriors Three were excellent. Asgard and Jotunheim were beautiful and alien; we seriously did not have the technology until recently to do some of what needed to be done to create those worlds. Very Kirby-esque designs.
The plot was well-done, seeming simple when it starts, getting tangled with Loki's machinations, then becoming simple again at the end.
Also, damn, they went seriously cosmic with this one. <3